The only sure way I know is to drain & replace the oil with the correct amount the see where it falls on the dipstick. Make the first check at one quart low for your low mark then put the last quart in & make your mark for full.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.