On our 86GT, I run s thick as i can get (203k+). Any brand is fine.
On the 96GT (196k car, engine ???), I run 5w30, any brand is fine.
If I ever get a low mileage car, I'd like to run Mobil1, it's really about as good as you can get if you really care abour it. Always was expensive though. Castrol full synthetic is supposed to be a close second from what ive heard. ymmv as always.
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