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Originally Posted by smazur
Does anyone care to pontificate on the recent change I made from Mobil 1 to regular dino oil... My mechanic, who's an MB specialist, has been keeping an eye on my head gasket leak on my 97 E320 130k miles. When he learned that I was using Mobil 1 10w30 immediately told me to switch to regular oil. He even said to switch to 15w50, but I just went to regular 10w30.
Since I made the change to regular oil I've noticed that my gas mileage has dropped significantly. I'd guess around 50 miles per tank. Can the switch be that drastic? I just changed plugs and all filters so I can't imagine what else it could be...
Any thoughts?
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Hard to say....are you putting off repair work on the head gasket?
There are numerous "high mileage" oils available today that are Group III syn and other Group IV/V full syn oils. Some of these oils are suprisingly good.
You may experience a small drop in fuel economy, but I can't believe it's that signficant when using a dino 10W30.
Mobil 1 0W-40 is the recommended oil for your car per MBUSA and per Mobil...contrary to popular anecdotal evidence.