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Brent 9/29/2012

1996 Cadillac Eldorado ETC 8 Cyl 4.6L

Preventive Maintenance

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?

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