I know. Use your judgement. Try it. It works for me. I can tell the difference between 5 or 6 quarts just by listening to it. My brother (a certified mechanic) did my last oil change. When I picked up the car I said "you only put 5 in". He said "isnt that how much it takes?". Lol.. True story...
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96 GT, P.I. Swap, X-PYPE, 4.10's, BAMA Chip.