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1ST DIY oil change question

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2005 996 C4S. Did 1st DIY oil change including installing L&N spin-on adapter, Mann ML1013 filter and DT40 oil. Owner's manual says 8.7 qts. with filter change. So I filled the filter before installing, added 8 qts while checking dipstick occasionally during filling. After 9 qts. and @8 oz. total it showed at bottom of stick, started, got oil pressure, checked for leaks and shut off. Waited for drain back and checked still at bottom line. BTW last time my Indie did it with stock filter change, he showed 8.80 qt. In addition, maybe just my imagination but seemed like less mechanical engine noise with DT40 compared to M1 0-40! I did make sure all old oil was out by lowering car back to ground following initial draining and got an additional 1/2 qt or so. I will drive tomorrow and do proper check, just wondering if this was weird. I think engine is stock without deep sump and I know I did not run engine up to operating temperature but is this unusual?





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