ZW7 has the nivomat shocks in the rear and a softer spring. Do you also have the G69 rpo code? I’m betting you replaced the rears with regular shocks and didn’t upgrade the springs at the same time and that’s why it rides like crap. I did the same thing and my problems were resolved with the...
Mine does the same thing. Fresh filter 35hot idle and 50 driving around, when I’m due for an oil change, 20hot idle and 42ish driving around. I change my oil every 3000 religiously.
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