G37 Oil Filter: What It Does, What Fits, and What to Know Before You Change It
The Infiniti G37 is a well-regarded sports sedan and coupe powered by Nissan's VQ37VHR V6 engine — a 3.7-liter, naturally aspirated unit known for its smooth power delivery and solid longevity when properly maintained. Oil filtration is central to keeping that engine healthy, and understanding how the G37's oil filter works — and what goes into choosing or replacing one — is straightforward once you know the basics.
What the Oil Filter Does in a G37
Every internal combustion engine, including the VQ37VHR, circulates motor oil continuously to lubricate moving parts, reduce friction, and carry away heat and contaminants. Over time, that oil picks up metal particles, combustion byproducts, and other debris. The oil filter's job is to trap those contaminants before they circulate back through engine components like the crankshaft bearings, camshafts, and variable valve timing (VVTL) system.
The G37's VQ37VHR uses a spin-on style oil filter — a self-contained canister that threads directly onto the engine block. This design is common, easy to work with, and widely available across filter brands. The filter sits relatively low on the engine, making DIY access reasonable for most home mechanics with basic tools.
G37 Oil Filter Specifications
The VQ37VHR engine in the G37 uses a specific thread pitch and housing diameter. Most compatible filters fall into a well-established size range, though the exact spec can vary slightly depending on model year. Cross-reference your model year and engine code before purchasing — the G37 ran from 2008 through 2013, and while the VQ37VHR was consistent across that run, it's worth confirming fit for your specific vehicle.
Key filter spec areas to verify:
| Spec | What to Check |
|---|---|
| Thread size | Must match engine block port — typically M20 x 1.5 for VQ37 applications |
| Outer diameter | Affects whether a standard filter wrench fits |
| Bypass valve rating | Determines pressure threshold before unfiltered oil bypasses the filter |
| Anti-drainback valve | Keeps oil in the filter housing when the engine is off |
The anti-drainback valve matters particularly on startup. Without it — or with a failed one — the filter drains back into the pan between drive cycles, causing a brief moment of low oil pressure when you first start the engine. This is especially relevant on a high-revving engine like the VQ37VHR.
OEM vs. Aftermarket Filters
Infiniti's OEM filter for the G37 is manufactured to match the engine's engineering tolerances. Aftermarket options from brands like Wix, Bosch, Purolator, Fram, Mobil 1, and K&N also produce filters that fit the G37's threading and housing dimensions.
The differences worth understanding:
- Filtration efficiency — measured in microns; lower micron ratings capture smaller particles but can reduce flow if not properly engineered
- Filter media type — cellulose (standard), synthetic blend, or full synthetic media (common in premium/extended-drain filters)
- Build quality — canister thickness, valve quality, and media construction vary between budget and premium tiers
- Drain interval compatibility — if you're using full synthetic oil and extending drain intervals, a filter rated for longer service makes sense; standard filters are typically rated for conventional or shorter synthetic intervals
🔧 OEM filters aren't always the only credible option — many mechanics and enthusiasts use quality aftermarket filters without issue — but filter quality does matter more on a performance-oriented engine with variable valve timing.
How Oil Changes Work on the G37
A typical G37 oil change involves:
- Warming the engine briefly to thin the oil
- Draining the oil via the drain plug on the oil pan
- Removing the old spin-on filter with a filter wrench
- Lightly lubricating the new filter's gasket with fresh oil before installation
- Hand-tightening the new filter (typically an additional ¾ to 1 full turn past gasket contact — check your filter's instructions)
- Reinstalling the drain plug with a new crush washer if needed
- Adding fresh oil, checking the level, and running the engine briefly to check for leaks
The VQ37VHR holds approximately 5.1 quarts of oil with filter replacement, though you should confirm this in your owner's manual for your exact model year and configuration.
What Shapes Your Filter Choice
Several variables affect which filter makes sense for any given G37 owner:
- Oil type and brand — synthetic oil pairings often benefit from full-synthetic filter media
- Drain interval — how frequently you change oil affects whether extended-drain filters are relevant
- Driving style — frequent high-RPM use or track driving puts more demand on filtration
- DIY vs. shop service — shops may use specific brands in bulk; if you're DIYing, you have full control over brand selection
- Budget — quality filters range from roughly $7–$20+ depending on type and brand, though prices vary by region and retailer 🛒
The Part That Only You Can Fill In
The VQ37VHR is a well-documented engine with a wide range of compatible filters available across price points. The general mechanics of oil filtration, filter sizing, and change procedure are consistent — but what filter makes sense for your G37 depends on your specific model year, current oil type, drain interval habits, and how you drive the car.
A filter that works well for a 2008 G37 Sedan driven mostly on highways at conventional change intervals isn't automatically the right call for a 2012 G37 Coupe used occasionally at the track with extended synthetic oil changes. The specs of the engine may be the same — but the variables around it aren't.
