Used Engines for Infiniti Q50: VQ37VHR & VR30DDTT Specs, Pricing, and Buying Guide

If your Q50 just threw a rod, dropped oil pressure to zero, or the timing chain finally gave out after 140,000 miles, you’re probably not in the mood for a lecture about maintenance schedules. You need an engine, and you need one that actually runs when it shows up. That’s the whole reason this page exists. We stock used engines for Infiniti Q50 pulled from real donor cars, tested before they ship, and priced so a full replacement doesn’t cost more than the car is worth.

We’ve been shipping used engines for Infiniti Q50 owners for years now, to independent shops, dealerships doing warranty work outside the manufacturer network, and plenty of people doing the swap themselves in a home garage. The requests all sound a little different, but the underlying question is always the same: where do I find a used Q50 engine I can actually trust, and how much is it going to cost me compared to going through the dealer.

Infiniti built the Q50 on two very different engine platforms depending on the model year, and knowing which one you’re dealing with matters more than most shops let on. Get the wrong motor and you’re stuck sending it back, eating shipping both ways, and starting over. So before we get into pricing and what’s currently on the shelf, let’s talk about what’s actually under the hood of your car.

Signs Your Q50 Needs a Replacement Engine, Not Another Repair

Most people don’t wake up planning to buy an engine. It’s usually a slow build — a knock that got louder over a few weeks, a check engine light that a shop couldn’t fully clear, or a tow truck after the car overheated on the highway. A few patterns come up often enough that they’re worth mentioning specifically.

A rod knock, especially one that changes pitch with RPM, is almost never something you drive through. If a shop pulls the pan and finds metal shavings in the oil, that engine is done — not “needs a repair,” done. Same story with a car that’s been run low on oil for a while; by the time the oil light comes on, bearing damage may already have happened. White smoke out the tailpipe that smells sweet, not like burnt oil, usually means coolant is getting into the combustion chamber, which points to a blown head gasket or a cracked head — repairable sometimes, but often not worth the labor compared to a used engine swap. And on the turbocharged VR30 cars specifically, a sudden loss of power paired with blue smoke can mean turbo failure that’s already sent oil or debris downstream into the engine itself.

If your mechanic has quoted you a repair that’s creeping past 60-70% of what a used replacement engine costs installed, it’s worth stepping back and asking whether you’re fixing the car or just delaying the inevitable.

Which Engine Does Your Q50 Actually Have?

The first-generation Q50 (2014-2015) launched with the VQ37VHR, a 3.7-liter naturally aspirated V6 that Nissan and Infiniti had already been refining for close to a decade in the G37 and 370Z. It’s a DOHC, 24-valve design with VVEL (Nissan’s variable valve event and lift system), and in the Q50 it’s rated around 328 horsepower and 269 lb-ft of torque. It’s a chain-driven engine, aluminum block and heads, and honestly one of the more dependable V6s Nissan has ever put in a sedan — assuming the oil got changed on time. The broader VQ engine family has been in production since the early 1990s, which is part of why parts and knowledge around it are so widespread.

Starting in late 2015 for the 2016 model year, Infiniti switched things up with the VR30DDTT, a twin-turbocharged 3.0-liter V6. This was a clean-sheet design, direct-injected, and available in two states of tune: a “standard” output around 300 horsepower and 295 lb-ft, and the Red Sport 400 variant pushing 400 horsepower and 350 lb-ft. If your Q50 badge says “3.0t” or “Red Sport 400,” this is your engine family, and it’s a completely different animal from the VQ37 — different mounts, different wiring harness, different turbo plumbing. You can read more about the platform’s background on the Infiniti VR engine overview if you want the full technical history.

There were also a handful of Q50 Hybrid models with a 3.5L V6 paired to an electric motor, and in some overseas markets a 2.0L turbo four and a 2.2L diesel. Those are far less common in the used market and we don’t stock them regularly, so if that’s what you’re driving, give us a call before you order anything — VIN verification matters a lot more on the oddball trims.

VQ37VHR Specifications

• Configuration: 60-degree V6, DOHC, 24-valve
• Displacement: 3,696cc (3.7L)
• Bore x Stroke: 95.5mm x 86.0mm
• Compression Ratio: 11.0:1
• Horsepower: approximately 328 hp @ 7,000 rpm
• Torque: approximately 269 lb-ft @ 5,200 rpm
• Valvetrain: VVEL (variable valve event and lift)
• Fuel System: Direct injection
• Used in: Q50, G37, 370Z, M37, FX37, QX70

We currently have a tested VQ37VHR engine for sale in stock — check the listing for current mileage and included components.

VR30DDTT Specifications

• Configuration: 60-degree V6, DOHC, 24-valve, twin-turbocharged
• Displacement: 2,997cc (3.0L)
• Bore x Stroke: 86.0mm x 86.0mm
• Compression Ratio: 10.3:1 (9.3:1 on Red Sport tune)
• Horsepower: 300 hp (standard) / 400 hp (Red Sport 400)
• Torque: 295 lb-ft (standard) / 350 lb-ft (Red Sport 400)
• Fuel System: Direct injection
• Used in: Q50, Q60, QX50 (early), QX55

Our 3.0L twin-turbo VR30DDTT engine listing has current stock details, mileage, and pricing.

Both engines are timing chain driven rather than belt driven, which is good news for anyone buying used — no rubber timing components aging on a shelf somewhere. But it also means a chain or guide failure is more expensive to fix than on a belt-driven engine, which is one of the more common reasons these cars end up needing a full replacement instead of a repair.

Why Q50 Owners End Up Shopping for a Replacement Engine

We see the same handful of reasons over and over. On the VQ37VHR cars, it’s almost always one of three things: a rod bearing failure from extended oil change intervals, a timing chain guide that wore through and let the chain slap around until something broke, or — less common but it happens — a car that was run low on oil long enough to spin a bearing. None of these are cheap to fix piecemeal once the damage is done. By the time a shop tears into a VQ37 with a knock, they’ve usually found enough collateral damage that a full engine swap is the more sensible option.

On the VR30DDTT cars, the pattern is a little different because these motors are newer and turbocharged. We mostly hear about turbo failures that sent debris into the intake and damaged a cylinder, carbon buildup issues common to direct-injection engines that eventually cause a misfire nobody can chase down, or accident damage where the front clip took a hit and the engine itself is fine but not economical to pull out of a car destined for the salvage title. That last category, honestly, is where a lot of our better low-mileage inventory comes from — cars with 30,000 or 40,000 miles that got totaled for body damage, not engine damage.

There’s also the boring, unavoidable stuff: a car that overheated because a hose let go on the highway and nobody caught it in time, or a timing chain tensioner that failed on a car nobody was watching the maintenance on. Whatever got you here, the fix is the same — you need a motor that’s been tested, not a gamble.

What We Actually Check Before an Engine Goes Out the Door

Every used engine that comes through our warehouse gets pulled from the donor vehicle, then goes through compression testing on every cylinder before it’s cleared for sale. We’re checking for consistent numbers across cylinders — a low reading on one or two cylinders tells you something the mileage sticker never will. We also do a visual inspection for oil sludge, coolant intrusion into the oil (a sign of a blown head gasket on the donor car), and physical damage to the block or heads.

We log the mileage off the donor vehicle’s cluster when we can verify it, and we note anything relevant — whether it’s a rebuilt title donor, whether there was any visible corrosion, how long the engine sat before pull. We’d rather tell you too much than have you find out the hard way after it’s installed. If an engine doesn’t pass our checks, it doesn’t go up for sale as a running unit — it gets parted out instead.

Q50 Engines by Year and Trim

Model Years	Trim	Engine	Notes
2014-2015	3.7, 3.7 Sport	VQ37VHR 3.7L V6	Naturally aspirated, chain-driven
2014-2015	Hybrid	3.5L V6 + electric motor	Less common in used market
2016-2019	2.0t	2.0L turbo four	Mercedes-sourced unit, limited availability
2016-present	3.0t	VR30DDTT 3.0L twin-turbo V6	~300 hp
2016-present	Red Sport 400	VR30DDTT 3.0L twin-turbo V6	~400 hp, higher-output tune

This is exactly why matching your engine code to your VIN matters so much when you’re sourcing used engines for Infiniti Q50 applications — two cars with the same badge can have completely different hearts under the hood depending on the exact build date and trim.

New, Remanufactured, or Used — What Actually Makes Sense

A brand new long block from Nissan/Infiniti for either engine family runs well into five figures once you add labor, and that’s assuming your dealer can even source one quickly — VQ37 crate motors aren’t exactly sitting on a shelf anymore. Remanufactured engines split the difference: you’re paying for new wear components inside an existing core, and warranties are usually decent, but the price still climbs fast, often two to three times what a solid used engine costs.

A used engine, pulled from a comparable donor car with verified mileage and a passed compression test, gets you back on the road for a fraction of either option. The tradeoff is obvious — you’re buying something with miles on it already, not a zero-mile part. For most Q50 owners, especially anyone driving a car that’s already past 80,000 or 100,000 miles, that tradeoff makes sense. You’re not trying to make the car last forever; you’re trying to get another 60,000-100,000 miles out of it without spending more than the car is worth.

What It Actually Costs to Replace a Q50 Engine

Numbers vary by region and by shop, but it helps to have a rough sense of where the money goes before you start calling around. A new crate engine from the dealer, when they can even source one, typically lands somewhere in the low-to-mid five figures once you add labor, gaskets, fluids, and the inevitable “while we’re in there” items a shop finds. A remanufactured long block usually runs less than that but still adds up fast — often somewhere between half and two-thirds of the new price, depending on the builder and the warranty terms attached.

Shopping used engines for Infiniti Q50 applications specifically is where the math changes. A tested used VQ37VHR or VR30DDTT, plus a competent shop’s labor to install it, often comes in at a fraction of either alternative — frequently under half of what a remanufactured unit costs once everything is added up. That gap is exactly why so many independent shops keep a source for used engines on hand instead of routing every job through the dealer parts counter.

Labor itself isn’t small regardless of which engine you choose — pulling and reinstalling a V6 in a Q50 is several hours of skilled work no matter where the replacement motor came from. So the real savings from going the used route come from the parts cost, not the labor. Get a labor quote from your shop first, then shop the engine separately, and you’ll have a much clearer picture of total cost before committing.

What to Confirm Before You Order

A few things matter more than people expect when they’re shopping for a used engine online. First, match your VIN’s engine code, not just the model year — Infiniti sometimes ran two engine options in overlapping years, and a mismatch means the wiring harness and ECU won’t talk to the new engine correctly. Second, ask whether the engine includes the wiring harness and ECU, or just the long block — this changes both the price and how much work your mechanic has to do. Third, confirm what’s actually included: some listings are a bare long block, others include the intake manifold, turbos (on VR30 units), and accessories. You want to know exactly what shows up on the truck.

We list all of that clearly on every product page — engine code, mileage where verified, what’s included, and photos of the actual unit, not a stock photo. If something isn’t clear, ask before you buy. It’s a lot easier to answer a question up front than to sort out a return on a 300-pound engine.

Why Buy Your Used Q50 Engine From Us

There’s no shortage of places online claiming to sell used engines for Infiniti Q50 owners, and it’s genuinely hard to tell them apart from a listing photo. Here’s what we do differently, or at least what we think matters: every engine gets compression tested before it’s listed, not after you’ve complained. We photograph the actual unit you’ll receive rather than a stock image. We document mileage whenever it’s verifiable, and we say so clearly when it isn’t. And when you call or message us with a question about fitment, you’re talking to someone who’s actually looked at the engine, not reading a script off a screen.

We also keep a rotating inventory, which means the specific VQ37VHR or VR30DDTT unit on our site today might not be the same physical engine next month. If you see one that matches your VIN and your budget, it’s worth acting on rather than waiting — good, low-mileage units don’t sit around long.

Shipping and Installation

We ship worldwide and crate every engine for freight transport — these aren’t small parts, so they go out on a pallet, bolted down, with the mating surfaces protected. Transit times vary a lot depending on destination and customs, so if you’re on a deadline, ask us for a realistic estimate before you order rather than assuming standard freight timelines apply everywhere.

Installation itself is a job for a shop familiar with the VQ37VHR or VR30DDTT platform, not a driveway swap for most people. Budget for new engine mounts, a fresh timing chain kit if your mechanic recommends it as preventive maintenance, new gaskets throughout, and fresh fluids. A lot of comebacks we hear about aren’t the engine’s fault — they’re an old sensor or a tired accessory that got reused instead of replaced during the swap.

Frequently Asked Questions

Will a VQ37VHR from a 370Z fit my Q50?

In most cases, yes — the VQ37VHR is shared across several Nissan and Infiniti platforms, though wiring and accessory brackets can differ slightly by year and application. Always confirm engine code compatibility against your Q50’s VIN before ordering.

Can I put a Red Sport 400 VR30DDTT into a standard 3.0t Q50?

It’s mechanically possible since both share the same block architecture, but the ECU tuning, turbos, and some supporting components differ. This is a job for a shop experienced with the platform, not a plug-and-play swap.

How many miles should I expect on a used Q50 engine?

It varies by what’s currently in stock. We list actual mileage on every listing when it’s verifiable from the donor vehicle, and we’re upfront when it isn’t. A well-maintained VQ37 or VR30 with 60,000-90,000 miles still has a lot of life left in it.

Does a used engine come with a warranty?

Yes, our used engines include a warranty period — ask on the specific product page or check with our team for current terms, since coverage can vary by engine family and mileage.

What’s included with the engine — just the long block, or more?

This varies by listing. Some come as complete long blocks with intake and accessories, others are bare. Check the product description or ask before ordering so there are no surprises on delivery.

Do you ship internationally?

Yes. We regularly ship used Q50 engines worldwide on freight pallets. Customs handling, duties, and delivery timelines are the buyer’s responsibility to confirm with their local carrier or broker, but we’ll provide whatever documentation is needed on our end.

Is a used VR30DDTT reliable after being pulled from another car?

Reliability comes down to how the donor car was maintained and how thoroughly the engine was tested before resale, not simply whether it’s used. That’s why we run compression tests and document condition rather than just listing mileage and hoping for the best.

Should I replace the turbos when installing a used VR30DDTT?

If the turbos on the replacement engine test fine and show no play or damage, there’s no automatic need to replace them. But if your original engine failed because of a turbo issue, it’s worth having a shop inspect the replacement unit’s turbos closely before final installation.

Ready to Get Your Q50 Back on the Road

Whether you’re dealing with a spun bearing on a first-gen VQ37VHR car or a turbo failure on a newer VR30DDTT Q50, the fastest way back to driving is a tested used engine at a price that doesn’t rival a car payment. Browse our current VQ37VHR engine and VR30DDTT engine listings, browse our full used engine inventory, or reach out directly if you don’t see the exact configuration you need — new units come in regularly and we can often source what you’re after.

Looking for a different make? We’ve also put together detailed guides for used engines for GMC Sierra, used engines for Chrysler 300, and used engines for Toyota Corolla trucks and sedans.