Originally posted by Elizabeth:
10W-30 is bad bad bad.Viscosity is the #1 factor in oil. Yes, this is very true. If the manual says use 5W30, you MUST use 5W30 and nothing heavier. The lighter 5 weight cold allows much better flow during startup. Once its warmed up, its the same 30 weight as 10w30. I know with the GM 2.8L & 3.4L pushrod V-6's they MUST use 5W30 also, or severe lifter damage can occur with heavier oils. Do what the manual says, not what others tell you. And the manual says 5w30, and nothing else.
'96 Contour SE, black / opal grey, MTX, every option, KKM intake, resonator removed, Flowmaster Series 40 DeltaFlow, GoodYear Eagle HP's, 115k miles, new paint 7/01. Driven cross-country 4 times.
'70 Corvette Stingray Coupe, Cortez Silver, 454 bored to 462, Muncie M21, too many mods to list, lots of fun. 335 rwhp / 365 rwtq
'02 Corvette Z06, Electron Blue / Black, every option. Stock for now...
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