The '01 GT calls for 5W20 and says in the owner's manual (in all caps) not to use synthetic oil under any circumstance, so I've been using 5W20 since I bought the car. Only thing is, I went 1500 miles over...without checking (like an idiot) and threw a rod. I'm still using the regular oil in the reman engine and it runs fine, but i'm dying to use synthetic...
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