Ya my 02 calls for the same5W-30 vs. 10W-30
New motors are much tighter tolerances, smaller passages, etc. than in the days of yore.
FYI; I had an '04 Z06, it also called for 5W-30
That is what prompted the change starting back in the 90,sthere would be one key turn/chance to get the truck running.
With the thicker oil in the crankcase when the Temps dropped the engine would turn over slower yet the fuel injection would still deliver the same amount of fuel and flood out the engine.
Bob Gutowski from the Warren training center told us that as well as using 10 weight oil as opposed to 5 weight in our climate. Their reasoning for a blanket coverage using the 5w30 was because they didn't know if the car was going to Alaska or the Mojave desert, made sense to me back then
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