What oil does my car take? (And tire pressure, and every other spec)
Standing in the auto parts aisle staring at forty bottles of oil is a rite of passage — and a solvable one. Your car needs a specific viscosity (like 5W-30), a specific quality spec (API/ACEA or a manufacturer approval), and a specific capacity in quarts or liters. All three depend on your exact engine, not just your model.
Where to find your oil spec (the traditional way)
- Owner's manual — the definitive source, usually under "Specifications" or "Capacities."
- Oil filler cap — many engines print the viscosity right on it.
- Manufacturer websites / VIN lookup tools — accurate but tedious.
- Parts store lookups — usually right, but they optimize for selling what's in stock.
What the numbers mean
5W-30: "5W" is how thin the oil stays in cold weather (lower = better winter flow); "30" is its thickness at operating temperature. Thicker isn't better — modern engines with tight tolerances are designed around thin oils like 0W-20, and running the wrong grade costs fuel economy and can accelerate wear.
The spec/approval matters as much as viscosity: an oil can be 5W-30 and still not meet, say, a required manufacturer approval like dexos or VW 504 00. Check the bottle's fine print.
It's never just oil: the specs drivers actually search
| Spec | Where it hides |
|---|---|
| Tire pressure | Sticker in the driver's door jamb — not the max PSI on the tire |
| Tire size | Sidewall + door jamb sticker (e.g. 205/55 R16) |
| Oil capacity | Owner's manual "Capacities" table |
| Coolant type | Manual; color is NOT a reliable indicator |
| Brake fluid (DOT 3/4/5.1) | Reservoir cap + manual |
| Battery group size | Battery label / manual |
| Wiper blade lengths | Manual or measuring the old ones |
Sold the manual with the car? Bought used without one? You're the exact person spec lookup tools were built for — and the reason WhisperCar auto-fills them.
The fast way: AI specifications in WhisperCar
WhisperCar turns the whole hunt into one screen:
- Register your car — make, model, year. That's all it needs.
- Open AI-powered specifications — the app auto-fills your engine details, oil type and capacity, other fluids, tire sizes and more.
- Verify with a re-check — one tap re-runs the lookup whenever you want a second opinion, so you can pour with confidence.
- Ask follow-ups in chat — "can I use 5W-40 instead?", "what tire pressure for full load?" — and get answers specific to your vehicle.
Every spec for YOUR car, one tap away
Oil type, capacities, tire sizes, fluids — auto-filled for your exact make, model and year, with re-checks on demand.