Believe it or not, this isn’t as simple a question and you might think. Different makes and models have different procedures for checking the transmission fluid level. For most American cars and trucks, (with the exception of Dodge and Chrysler) you would do the following: 1. Make sure the vehicle is on flat ground. 2. Make sure that the engine is running and the trans is in park. 3. Open the hood, and locate the transmission dip stick. 4. Pull the dip stick out and wipe off any trans fluid with a clean rag. 5. Re-insert the dip stick all the way, then pull it back out. 6. Check the leading edge of the fluid against the level marks on the stick. (Check both sides of the stick to be sure you are getting a true level) For most Dodge and Chrysler Products, you would do the same procedure except you will set the parking brake and place the transmission into neutral. BMW – Depending upon year, may require a hoist to check the trans level. Mercedes – Depending upon year may not have a dip stick. (we have one) Honda – 2006 – 2007 May require special procedures, check you owners manual.