Is there any significant difference between "high-mileage" oils and normal oils that I should be worried about. I did my recent oil change with this:
http://www.mobiloil.com/USA-English/...ge_10W-40.aspx
because it was the only synthetic 10W-40 I could find at the wal-mart I went to. It's fully synthetic (not a mix) and it isn't energy-conserving so I figured it was okay, but I just want to make sure. Probably should have asked a while ago
