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Thanks, everyone, for the suggestions so far!

Originally Posted By: scurvy Sounds like you don't necessarily know if it is sludged or not (and the 2.slow isn't a known sludger, but definitely a burner) so I wouldn't bother with any expensive oils until you have that figured out. I don't know much about sludge. How can I tell other than by...

I just bought a used 2003 VW Jetta 2.0L (V4, naturally aspirated) with 86k miles. The previous owner appears to have been the type of person to change the oil semi-regularly but at oil change garages at the lowest cost possible or with a coupon. The engine seems dirty under the oil filling cap...