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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.
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.