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General questions on oil



Anyone know the type of oil they use at the dealers for an oil change?
I mean what weight do they use? Do they use a 15w40 or a 15w50. Do they
change the weight according to the season? This is down
here is Dallas. What is a good brand of oil. Is mobile better 
than castrol etc... Also, what is the difference between a synthetic oil
and a non-synthetic one. Which is better?

Thanks much for any info...
Reji 
'95 M3 - Cosmos Black - 30k miles - just loving it.