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hey Cure actually the 30 in 5w30 is when it is cold. The oil gets thinner as it gets hotter. Thats why you have tons of oil pressure cold. I personally ran castol 20-50 in my trooper with a 2.8. When your wheelin you break oil down real quick. i use castrol 20-50 now in my Xj and love it. you do lose gas mileage so be advised. the 20-50 does slow things down since it is so thick. i seen a 2 mpg diff. in my daily driver going from 20-50 to 5-30 <img src="/forums/images/graemlins/confused.gif" alt="" />. oh well i dont daily drive my rig though so thats another factor to look at. <img src="/forums/images/graemlins/cheers.gif" alt="" />


oh wow, ok, I had it wrong then. On one of those oil sites I read that the "W" in the weight stands for winter, and therefore the first number was the cold. Maybe I misread it as the first number andthat is what "W-40" means then.


The W does stand for winter and it does mean it's as thin as a 5 weigh when cold to let the oil flow better (gets to every thing quickly) in cold weather during startup, makes for less startup wear in cold weather, then as thick as a 30 weigh when hot to provide thicker protection when things are warmed up and oil has already reached everything.

1998 Honda Passport EXL V6 3.2L Auto SOTF 4WD
3" Calmini Lift w/ HD Track Bar, 32x11.5-16 Super Swamper SX, Aisins

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