i read somewhere that a new engine needs to break in properly and synthetic probably shouldn't be used until it has over 10k miles on it. i'm sure there are a million different opinions on the subect, though. just to be safe, i'm waiting until 10k before i put Mobil1 in the WRX. i figure, it can't HURT to just use regular oil 'til then.... 
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Alan
1987 928 S4 (Black) SOLD! 
1997 SVX LSi (Ebony) SOLD!
2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD!
1987 928 S4 (Black) SOLD!
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