That's the problem with guys ordering the dipstick for the engine or transmission. They are virtually useless without knowing the temperature of the oil being measured. There is no single answer. You need the SDS to monitor the oil temperature to know if your reading is correct or not. At least on the trans dipstick there is a range for the certain temeratures, as the stick is only good for the 722.6 transmission (so far). The engine oil stick is good for several motors, so is just measured in mm, and you need the SDS to know if the reading is correct. For the older engines without an oil temp sensor, they have a chart and there is a special tool temp probe to measure the temp. there is a reason they make the dipstick a special tool, it ain't that simple.