1996 Cadillac Eldorado ETC 8 Cyl 4.6L
what oil type(reg or synth) and what weight is recommended for northstar engine. also is 91 octane mandatory for engine
I have heard 89 is acceptable octane but 91 is supposed to be used in northstar engine. I live in mild climate...what oil weight should be used? synthetic or regular? Mobil 1?