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Does Mobil Have a Synthetic Equivalent for 15W-40?
 
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.
Question:
Does Mobil Have a Synthetic Equivalent for 15W-40?
I currently use Mobil 1 5W-30 full synthetic in my wife's Toyota Matrix. I have a 2006 Ford Super Duty with the 6.0 diesel; it calls for 15W-40 at 5,000-mile intervals on the oil change. Should I use the 5W-40 full synthetic Mobil or do you make a 15W-40 synthetic? If I use the full synthetic Mobil on my truck can I extend the oil changes to say 7,500 miles? I currently go 7,500 on my wife's Toyota and your Mobil 1 holds up great. I will not use any other oil. Thanks.
-- Mike Lowery, Imperial, MO
Answer:
Mobil 1 Turbo Diesel Truck 5W-40 is formulated to exceed the latest industry requirements for diesel engines. ExxonMobil recommends that you follow your owner's manual recommended oil change interval.
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