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I track and change oil often. I believe if you do some research you'll find Mobil changed there formula of the oil in the last 10 year due to federal guidelines on emissions. It is designed more for the newer models. Motul although more expensive is a better formula. and then there is always the Gibbs DT40. both are 5-40 blends.
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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