Quote:
Originally Posted by JCunningham
plenty of failures on cammed cars because of people using regular full synthetic. You need ZRod. track club dont you remember all the cammed ls motors that were blowing up because they were using mobile 1. GM says 15w40 is fine for track use so 10w30 is fine for everyday use. With a cam you should be letting the car warm up befor romping on it so the oils going to act like 30w the same as 5w30. if your going to be driving the car in below freezing temps you should put 5w30 in it. people have been running ZRod and Driven for over 100,000 miles and it never clogged a cat. maybe in 200,000 miles it might
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Plenty of reasons for a cammed motor to grenade other than oil. Starting with the specs, quality of build, redline increases, internals, valve springs, bad tunes, timing chains etc. Personally, i know a few guys with cammed LS3s who use regular Mobil1 5W30 and beat up on their track cars with zero issues. I have had a cammed C5Z and hammered on it for years with no special oil. The car is now 15 yrs old, still going strong with an original motor and Mobil1 5w30 in it.
GM is saying 15W50 higher SAPS oil is fine for track because those cars will be WOT most of the time. But note they say NOT to use it for street. This is little to do with its grade and much to do with its SAPS content, which Amsoil says clearly that ZRod doesnt meet re new spec limits. Note they do not provide specifics in their data sheet, so one doesnt really know how much SAPS it contains.
Keep in mind that forced induction is very hard on motors, yet ZL1s survive putting out serious power on GM recommended oil with low SAPS. And I am yet to hear about a single LT4 failing (Camaro or Corvette) yet ppl have been beating up on them for 6 yrs and counting.
Like i suggested before, the OP should call a pro shop like Lingenfelter, or others like him. And no doubt they would ask him questions about his build before offering any advice. That's for damn sure. Anyhow, i dont think i can add any value added here, beyond what i have already stated. Ciao and all the best!