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Old 03-04-2011, 06:59 PM
Twisty Twisty is offline
Ford Tough
 
Join Date: Jun 2009
Posts: 422
Default Re: Synthetic oil vs Regular oil

Rumor has it that conventional oil has an additive that causes the gaskets to swell, which may improve sealing.
Synthetic may not have it. I suppose it depends on the brand or type. An additive (Lucas?) can be used if synthetic seems to "cause" a leak.
I went to Royal Purple at about 36k miles - everything is still dry.
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2006 4.0 5 spd auto 4x4 Super Cab
BF Goodrich Commercial Traction T/A's
Royal Purple Throughout
Alpine Head Unit with some Infinity Noisy Stuff
NW Oregon
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