OK, now that you've all got that out of your system (and beat me to it)...

Does your oil level go down to a certain point - say a quart low or two quarts low on the dipstick, and then stop going down? Or if you don't refill it, does it keep going down?

If it stops going down at about the same point (1 qt - 2 qt low) consistently, then that would be a pretty good indicator of the dipstick being the wrong one - and too long.

Another way to figure it out would be to do an oil change and put in exactly the factory recommended amount of oil. Start it up, let it run only long enough to get up to temp and shut it down. Let it sit 5 minutes and do a dip stick reading. If it is reading low, then that is also a good indication that the stick is the wrong one.

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1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown