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Originally Posted by robs90zr1
New ZR1 owner. I've owned 3 N.C.R.S Top Flight Vettes. 1 - 65 / 1 -68 / 1 - 70 & I have always done my oil changes. Someone in ZR1 land tell me the correct way to change the oil in my 1990. I've been told it held 12 quarts & the owners manual says 8.6 quarts. Do you have to drain it overnite ??? What's up ?? ---- Rob
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Welcome Rob
When you change the oil about 3.4 qts. stays in the engine. You can not get it out.