Re: Opinions on oil
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Originally Posted by jrd1990zr1
I am not sure if the oil currently in the car is a synthetic. Is there a problem with any residual oil in the engine mixing with the Mobil 1?
Thanks guys for the advice.
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JRD, I had the same Q when I got mine as the orig owner didn't believe in syn oil for the car. I just changed the oil & filter and let it go for the usual 3K miles/3mos and changed it again. I had no strange noises nor did anything negative occur. 14K miles later everything is still okay! 
Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member
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