Quote:
Originally Posted by Eric Baker
^Only problem with super long intervals is oil consumption, you could be really low on oil by that 25k mark, so keep an eye on it.
I haven't changed mine yet(<800mi) but when I do, I'll be going Castrol Edge most likely. I've always run Castrol and never had an issue. I'll also be swapping tranny and rear end to RP.
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That's not the only problem... The oil can also get dirty (I'd never go 25K miles on an oil filter) and can also become contaminated with water condensation. I'd never go past 10K miles or one year.
I use Mobil 1 Synthetic 5W30 because its GM approved and available at WalMart for $4.70/qt. I plan to change it yearly (which amounts to about 5000 miles for me).