Not a 914 but need brain trust help...., 944 turbo oli won't show on dip stick..... Options

[second wind]

I know I am off topic by one digit but maybe someone can help....I just changed the oil in my '89 944 turbo and have put at least 7.5 quarts of oil into it....but it doesn't hit the dip stick yet. Never had this problem before. No leaks or anything....good oil pressure....and even if the new oil is so clean you couldn't see it it would still be wet and shiny....which it isn't. I am afraid to put more oil in.....most sources say 6.5 quarts should do it.....anybody have any ideas on this? Very weird....
Thank you,
gg

[second wind]

Ok....all done....final post on this...for now of course....I got the oil up to the high mark on the dip stick but it took ten quarts....maybe a little less ....I know you think I am nuts or drunk or high or stupid but I am not.....I measured the old oil and it was seven quarts and I was good on the stick.....the only explanation is that Valvoline sells short quarts.....what else could it be? I am leaving in turbo tomorrow for a 1,000 round trip to June Lake, Calif. Just up the street from WCR 2017 which I attended.....944 is a luxury car compared to 914 (no offense anyone) and twice as fast easy so I am taking it.....I will measure a quart of Valvoline in the same container I have and see how it measures up pun intended...or whatever....this has been stressing me out as too much oil will ruin your whole day...and then some. Thank you again all for your care and help.
gg