What does this mean please?
In my Ford Focus owner's manual it says "Oil expands when it is hot. The level may therefore extend a few millimetres beyond the MAX mark."
If I were to check the oil 10 or 15 minutes after turning the engine off, would the oil still be "hot" and hence have expanded a few millimetres above the max mark? Or does this only apply if I were to check the oil level immediately after turning the engine off? In other words after 10 or 15 minutes would the engine have cooled enough for the expansion to not apply?
I think so, but I would wait about a half an hour (30 minutes) to be safe.
Yes, the oil would still be "hot". It takes several hours to cool down completely. That's why it's best to check your oil level first thing in the morning BEFORE you start the engine for the first start of the day.
I doubt a few millimeters maters either way.
Just check it when it is cold.
And if it is 3mm below full, what are you going to do add a tablespoon of oil?
The absolute best time to check oil is when the vehicle has not run for hours. Other than that when checking oil, give it a few minutes to assure the oil is in the pan, not still in the engine. That minuscule expansion for oil being warm/hot is a mute point unless you are adding oil by the ounce, not quart.
I've only seen fluid levels on a dipstick change from cold to hot when it's the ATF in the transmission. I wouldn't be overly concerned when checking the motor oil.
You do understand your talking about mm! It doesn't matter. Just check the oil level whenever. As long as it is in between the hash marks. ITS FINE!
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