Mobil 1 Logo with trademark
Mobil 1 RacingTM
Car Care for a Better Ride

My Mobil
Discover the Benefits of Membership
Forgot your username or password?

YouTubeMobil 1 Merchandise
Mobil 1 Rewards
Ask MobilAsk Mobil
Why Use Mobil 1 0W-40 Instead of Mobil 1 10W-30 in Newer BMWs
Ask Your Stickiest Question. . . Or ask us something you’ve always wanted to know about using our products. We’ll sort through all the submissions and present the best questions to our automotive experts. We'll share the questions and their answers here.
Why Use Mobil 1 0W-40 Instead of Mobil 1 10W-30 in Newer BMWs
I have used Mobil 1 for more than 20 years in its various forms, and it has always given me confidence with my performance oriented vehicles. I have questions about Mobil 1 10W-30 vs. 0W-40 for my newer BMWs. I live in Indiana but the cars don't see very cold winter conditions. I use 10W-30 Mobil 1 instead of 0W-40 (which is 'approved' by BMW) for the inline 6s, but I change the oil at 3-5,000 intervals to keep the Double-Vanos valvetrain clean and smooth operating. I know the 0W-40 is certified for the longer service ACEA A3/B3 specification but there is something about the thin 0W oil that makes me leery. Is 10W-30 somehow less optimum for wear protection compared to 0W-40, even at the shorter change intervals? I also read the 10W, versus 0W, at startup, leaves a bit more oil film on the metal, even though the 0W is designed to flow a bit faster at startup. I also read somewhere the 10W-30 has less VI additives and more PAO basestock, since it is a narrower range. True?
-- Mark Stephens, Zionsville, IN
We recommend you use the Mobil 1 0W-40 that is specifically designed for your vehicle. The 0W-40 viscosity grade actually provides a thicker oil film at operating temperature compared to the 10W-30. In addition, under winter ambient conditions, it will provide better and faster protection at start-up. This makes you a winner under both high and low temperature operation.
Ask a QuestionAsk Mobil
Copyright 2005-2014 Exxon Mobil Corporation. All Rights Reserved. ExxonMobil Home | Site Map | Contact Us | Privacy | Legal