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Would Thicker Oil Stop Lifter Noise?
 
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:
Would Thicker Oil Stop Lifter Noise?
Can I use Mobil 1 High Mileage 10W-40 synthetic oil in my ‘05 Mercedes-Benz ML 350? It has 78,000 miles and the manual recommends Mobil 1 0W-40, which is what I've been using for the last six years. I have noticed lately that the lifters are making a loud noise when it starts in the morning cold. It does go away after 10 to 15 minutes. I figure I might need a little thicker oil to keep the lifters coated with oil overnight until the next start up. And, by the way, I do I really need to use this 0W cold start viscosity in Los Angeles, California? Your response is deeply appreciated. Thank you.
-- Arbi Baniago, Lakewood,, Calif.
Answer:
In your area, there is no concern with moving to a 10W-40 viscosity grade oil.  Mobil 1 0W-40 synthetic oil is approved against MB 229.5 and MB 229.5 which is likely specified by your owner’s manual.  Both Mobil 1 0W-40 and Mobil 1 High Mileage 10W-40 synthetic oil meet the ACEA specifications targeted for European vehicles - A3/B4 and A3/B3.  Regarding the lifter noise, moving to a slightly higher viscosity oil may not solve this issue.  We suggest you consult with your mechanic to ensure there are no underlying mechanical issues.
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