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Synthetic oil - what weight? (archive)
[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Posted by Ed on August 12, 2001 at 21:06:30:

I have a 92 525 with 50k, been using 20-50 Castrol scince new. I am thinking of changing to 5-50 Castrol synthetic. Anyone know a downside to this? An alternate would be 15-50 Mobil 1.

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