When my mechanic does an oil change, he routinely overfills the oil by about 1/2 to 3/4 quart. The dipstick measure about 3/4" above the full mark. He says engines burn oil so he overfills the oil. Is this harmful to my engine? If so, should I have some oil removed.

I don’t think that a “small” amount of overfilling oil will do any damage. The problem is that all engines are not the same. If your daughter experiences oil leaks then her engine is probably suffering the effects of overfilling. I personally never overfill anything because there is always a chance …

A small amount of extra oil won’t hurt anything. Does your engine burn a bit of oil? I do not believe all engines burn oil. Many do, but not all.

The mechanic is likely making up this story, since he likely has a number of full bottles of oil an most cars do not take an even number of bottles. He is supposed to fill it to the factory designated level, and give you whatever is left over in the bottle to take home. But that takes work, and som…

Just tell him to add the correct amount of oil and promise that you will check it regularly. (But then you have to keep the promise).

They’re supposed to give you the leftover oil to take home? Really? I guess it really has been a long time since I’ve had my oil changed by someone else. At least since before they had 5-quart bottles. Hey, howcome they didn’t start packaging oil in 5-quart bottles until most cars had switched ove…

Disclaimer - I really don’t know :slight_smile: But my dad told me it was worse to overfill than to under-fill a little. His reasoning was that added pressure would be put on the engine seals. Makes sense to me, and certainly doesn’t hurt to be careful not to overfill. When I discovered a year or …

Yes, my service station will fill the crankcase to the exact full level and the 1/2 bottle left over will be put in a plastic bag and left on the floor of the car. The rapid service in my area ( good, not a Jiffy Lube) ) has a computer program that scans the VIN and then has the precise amount del…

I agree with your dad. I’ve seen oil seals fail because of overfilling. And, I have a 2000 Ford Explorer, 193,000 miles on it, and doesn’t need extra oil between oil changes every 6 months (about 5,000 miles). May it burns 1/4 of a quart between changes.

I don’t agree at all the the quanity of oil (in this case a small amount overfill) will increase oil pressure. Now if we are talking about crankcase pressure this would take a double shot of oil to do that.We would see high crankcase pressure due to the quanity but low gallery pressure due too “foam…

Overfilled Oil Change

Maintenance/Repairs

Rod-Knox March 22, 2010, 7:18pm 5

How many quarts is being added?

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Overfilled Oil Change

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