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Old 10-30-2000, 11:04 PM
anthonyb anthonyb is offline
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Join Date: May 1999
Location: Sacramento, CA
Posts: 1,472
I've heard of going conventional to synthetic causing problems with older cars (both on this board and from my dealer), but our cars were converted early in their life, so I don't have any personal experience there.

As one for the interesting stories file, for many years we ran 15W-50 Mobil 1 in our '87 300E, during which time it started consuming oil heavily. The first time, we had a valve job done, and it fixed the problem. It started happening again a few years later, to the point where it was about 1qt every 800 mi. Then, our dealer started using 5W-50 Castrol Syntec, and right at the same time our oil consumption went down to almost zero. It still drips a little bit of oil, but the change on the dipstick is barely noticeable. Very strange..

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