I would strongly recomend sticking with synthetic oil.. As its been said, synthetic has been proven time after time to out perform dyno oil. I believe it is worth the extra cash in the long run. I would still change your oil at you 3-4k intervals regardless. As for recomendations, i would put royal purple at the tippy top of my list. I am going to switch to that tonight in the explorer. I currently use Castrol Syntec. I like it, but i have heard amazing things about royal purple, so everything is getting it, from the motor to the diffys. I first used mobil 1, but didnt like how quikly my lifter tick came back. The syntec kept it away for a long time. Juat my .02!!!
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1994 Taurus SHO MTX
134k 3.0 DOHC 60 degree V6
Intake
plans:Eibach lowering springs (1'' front .5'' rear)
'96 Brake upgrade
KYB GR-2 struts
BBB (big bore butterflier)
Extrude honed intake
3.2 swap with balanced rotating assembly
stage one cams
full custom exhaust
BOOST
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