My car requires 4 & 3/4 quarts of oil to be right at the full mark.
Occasionally, I've bought the 5 quart jugs of oil ( when it was in stock, mostly its not in stock ) and added all of it to the engine. Level was maybe 1/4 to 1/2 an inch over the full mark. No problems. By the time the next oil change came the level was down to the full mark.
I've got an old washer fluid - 5 quart jug that I have lines marked off at every quart line up to the 4 & 3/4 mark.
I can mix in a quart of Mystery Marvel Oil then fill the rest of the way with 10 W 30 and I'm all set for the next oil change.
One time last winter, slightly overfilling using 5 W 30, it warmed up to
60 degrees for a few days and some oil leaked out the rear seal. I can use 5 W under 50 degree temperatures. This was the only time it leaked. The Thinner oil & the warmer temps caused it.
Good Luck.
========= Harryface =========
1991 Pontiac Bonneville LE 3800 V6 ( C ), Black/Slate Grey _~_~_~297,188 miles_~_~_
~_~_~_~_U.S.A._~_~_~_~_~_
~~~The Former Fleet ~~~
89 Cavalier Z 24 convertible
78 Holiday 88 coupe
68 LeSabre convertible
73 Impala sedan