Valvoline Advanced runs about three bucks less than Mobil 1 per 5-quart jug. Both are API SP. Where the difference actually shows up — and where it doesn't.
Both meet ACEA C3 and stack OEM approvals across BMW, Mercedes, and VW. Where they actually diverge — and which one belongs in your European garage.
Both promise 15,000-mile drain intervals. The chemistry, the warranty, and the BITOG used-oil data — what actually holds up across the long haul.
Severe service kills the marketing claims. Here's how Mobil 1 Extended Performance and Castrol Edge actually compare under towing, heat, and short-trip duty.
Both meet the Honda 0W-20 spec. The real question is how each handles the 1.5T fuel dilution issue and the hybrid's heat profile. Here's the data.
Valvoline vs. Castrol: both pass API SP and ILSAC GF-6A. The difference is in product lines, pricing, and where each brand outperforms the other.
Pennzoil vs. Mobil 1: both are full synthetic API SP oils at similar prices. The real differences come down to base oil source and certification coverage.
Mobil 1 vs. Castrol Edge: same base stock, same price. The real difference is OEM certifications — dexos1 for GM, BMW Longlife for Castrol.
The best synthetic motor oil for most drivers is Mobil 1 Advanced Full Synthetic. Here's how 6 top brands compare — plus which to buy for your engine.