wat kind of oil do you guys use in your sc saleens, my first 2 oil changes i used 5w-20 syntetic penzoil, also i had an offer to swap rear ends with a buddie of mine he has a 2003 Saleen Cobra with an Irs i have an 02 s281 sc with a live axel, i can pick any gears i want for the rear end if i swapm with him wat do u guys think