How to find the right Motor Oils AI guide

Written by an AI model from its trained knowledge.

What the AI looks for in Motor Oils

Viscosity: Use exactly the SAE grade in the owner's manual or on the oil filler cap, such as 0W-20 or 5W-30. Modern engines with tight tolerances and variable valve timing are calibrated for that grade.
API / ILSAC standard: Gasoline engines need the current API service category (SP or later) with the ILSAC starburst. 0W-16 and thinner grades require the ILSAC 'B' sub-category (for example GF-6B). These standards cover protection against low-speed pre-ignition in turbo direct-injection engines, as well as wear and deposits.
OEM approvals: If the manual lists an approval, the label must show that exact code, such as GM dexos1 Gen 3, VW 504 00/507 00, MB 229.71 or BMW LL-01. European and some GM engines rely on these approvals for warranty coverage and emissions-system protection.
Diesel and emissions systems: Diesels need the specified API C-category (CK-4, or FA-4 only where allowed) or the ACEA C-class low-SAPS spec. Low-ash formulas protect diesel particulate filters and catalytic converters.
Synthetic vs conventional: Use full synthetic when the grade or approval requires it, or for turbo engines, extreme cold or extended drain intervals. Synthetic resists breakdown under heat and stays fluid in cold weather.

Mobil 1: Synthetic oils with many OEM approvals, including dexos.
Pennzoil Platinum / Ultra: Synthetic oils made from a natural-gas base stock, with dexos approvals.
Castrol Edge: Synthetic range with broad European OEM approvals.
Valvoline: Widely available full synthetic and high-mileage oils.
Shell Rotella: Heavy-duty diesel oils with API CK-4.
Liqui Moly: European oils with many specific VW, MB and BMW approvals.
Motul: Synthetic car oils and motorcycle oils with JASO MA ratings.
Amsoil: Synthetic oils marketed for extended drain intervals.

Oil that shows only an old or obsolete API category
Car oil with friction modifiers in motorcycles with wet clutches (use JASO MA/MA2 oil instead)
A heavier or different grade than the manual specifies 'for extra protection'
Running a European car on oil without its required approval code

Yes, they are compatible for topping up, but the blend only meets the lower spec, which matters if your engine requires a synthetic approval.