Hi all - I just bought a 1991 318is and it appears to have an oil leak. I'll dig into the leaking problem further but upon asking the previous owner which type of oil he was using, he told me it was synthetic (Castrol if I'm not mistaken).
I know there's an old myth that once a car has had synthetic, you cannot switch back to conventional. My questions are:
1 - is that true??
2 - if true, what is your preferred synthetic oil for an M42 with 114K original miles? I have zero service history.
3 - if false, what is your preferred conventional oil for the M42?
Thanks for any and all help!
I know there's an old myth that once a car has had synthetic, you cannot switch back to conventional. My questions are:
1 - is that true??
2 - if true, what is your preferred synthetic oil for an M42 with 114K original miles? I have zero service history.
3 - if false, what is your preferred conventional oil for the M42?
Thanks for any and all help!
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