I've had problems with dipstick markings in the pass.
Here is what I do now.
If you know how many quarts the pan holds just add that amount of
oil and check the dipstick. Remark the dipstick if necessary. Then crank the motor, let it run for a couple of minutes, shut it down, give it ten minutes for the
oil to drain into the
oil pan, check the dipstick and add oil to bring it to the full mark. What you add will be the amount the filter, remote oil lines, cooler etc hold.
If you don't know how much oil the pan holds, remove the pan. Add water that you have measured (I like to use old oil bottles) till the water reaches the level I marked in the drawing.
Clean out the water and install the pan. Then add the measured amount and mark the dipstick.
I used this method on a 440 Mopar oil pan because when I googled it I had two different amounts listed. Later I found that some vendors advertise the amount the pan held with the oil filter included. Which was a half quart difference.
