In Reply to: Re: Synthetic Motor oil vs Mineral. posted by sam on February 25, 2000 at 15:59:15:
: It was my understanding, though, synthetics leak more than mineral based oil's, hence older gaskets on older cars might spring more of a leak than regular oil?
: : I researched this topic extensively and it revealed absolutely no down side to using synthetic engine oil. I run total synthetics in both my cars, engine, transmission, differential, power steering. I change engine oil every 6-8k and change the filter every 3k. I could go much longer but some habits are hard to break. I use Mobil 1 because it is available everywhere. I also use B&G 44K to clean the fuel/injector system and B&G MOA (motor oil additive) semi-annnually to keep the engine clean. I am a maintenance hound. The end result is I have no qualms about running to redline. Regards.
: : cek
: : 92 325is
: : 94 525it
The leaking problem is something that depends on the type of synthetic oil, diester or polyester (I think). Some types cause gasket shrinkage while others don't. If I'm not mistaken Mobil 1 does not have this problem. But if you're using the BMW synthetic which is a 5/40 then the thinness of the oil may allow a little more leakage or seepage. But there is not question as to the benefits of using synthetics.