There is no truly accurate way to measure the oil using either the dipstick or the dash gauge.
The only way to measure it accurately is to measure what came out and replace only that amount (be sure to include the oil in the cannister and filter).
This is because in '99, Porsche, in response to some bearing starvation issues, revised (increased) the oil capacity in TSB: Boxster 2/99 1 1701.
In this TSB, they revised the oil capacity from: 8.25ltr. (8.7USqts.) to: 8.75Ltr. (9.24USQts.) - w/ filter. An increase of slightly more than 0.5 USQt.
But, they never revised the dipstick or the sending unit for the dash gauge, making both of these invalid. If you fill to the full mark on the dipstick or gauge, according to this TSB, you are underfilled.
The biggest reason people overfill these cars is that they either do not have the car level when draining, or they do not allow 20-30 min. time for all the oil to drain out (or both).
Last edited by Lil bastard; 10-20-2008 at 07:12 AM.
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