Let the car sit overnight on a flat surface. The dipstick has a low and high mark near the botton end that slides down the tube.
Start the car in the morning. Pull the stick out and wipe clean with a very clean lint free cloth. Stick back in. Hold for a few secs. and remove. The fluid level should be about 10mm below the lowest mark on the stick - the low level line.
To test the hot fluid level, drive car at least 15 miles. I prefer 20.
Do the same thing and while idling on a level surface. This time the fluid level should be no higher than the highest mark on the stick.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.