Dealer put 6 qts. of Mobile 1 in instead of the specified 5 3/8 qts.. Okay?
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I just got back to the office a few minutes ago. I need to check the dipstick. But, I always change the oil filter when I change my oil.
Thanks for the input!
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It would only be TOO much if they didn't drain all the old oil out. Check the stick and if reasonably close to full line don't worry but next time have them do 5-3/8 or 5-1/2 if they can't get it exact.
Way too much oil can foam and that can cause an issue but 5/8 extra shouldn't do that.
Clint
Way too much oil can foam and that can cause an issue but 5/8 extra shouldn't do that.
Clint
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137 Posts
If you will lose 5 HP from 5/8 too much will you gain 5hp for every 5/8 low you are? And no I wouldn't actually do this.
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Some of you guys need to get a grip. No damage will be done by overfilling by 5/8th of a quart. You won't lose 5 H.P. over 5/8th of a quart. When I change the oil, it takes 6 quarts to bring it up exactly to the full line.
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I was up under my truck getting ready to dump 1.25 quarts out for that extra 10 HP! How much do you gain if you drain it all out?
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300!!
But really over filling isn't going to hurt anything. The possible loss of power would be from crank resistance pushing through the extra oil in the pan. Please drain no oil lol
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I guess you have no clue how a motor works then....
Just a quick overview is this. The crank in which the pistons are attached to using connecting rods rotates in an oil bath. When the oil is further up the crank, resistance is increased. This will cause drag and will result in lower hp numbers. I am not saying you will loose half your power but a small percentage around 5hp or so. I believe it was RBsTitan on CT that did a dyno run and lost power. He found that he added too much oil (around a qt) and this cost him 12hp or something stupid like that.
Now for the others comment about gaining 10hp from running it low, that is just stupid. Yes, you may cut down on the drag but you will not have enough oiling ability to keep the motor running correctly.
Now if you look into performance motors they address these issues. They do aerodynamic testing on the crank to ensure that when it cuts thru the oil bath, it cuts down on the resistance. Instead of smashing a brick thru the oil, they shave it down to a blade. This cuts down on resistance which doesn't make HP but it frees up HP.
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^truth. And the reason for some "knife edged" crank designs in some builds
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You are totally right but I think the point the other guy, sorry I didnt pay attention to the username, was tryin to make is even half a qt over fill wont kill the motor so its not that big a deal. Now had we said oh wow they added like 2 or 3 then yes that would certainly be a problem!! But such a tiny amount wont do a damn thing other than add extra oil to the motor. When I do my oil change I only add 5 and the level sits right smack in the middle of the dots on the stick. Hasnt affected the truck in any way shape or form.
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I have been working inside engines since you were probably in diapers and I can tell you 5/8th of a quart with a sump near 5.5 quarts won't do squat...period. No point in even worrying about it. Now if he said 8 quarts was put in....completely different story.
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You are still missing the point. It doesn't matter how much extra oil is added past the OEM spec, it will cause more drag and could result in a loss of power (very minimal at most thou). 5/8ths or 1/2th or etc.... it doesn't matter, any little more will increase drag and thus less power.
I do agree thou, it won't make any real difference for daily driving thou.
I also agree that if he over filled by 2-3qts, there could be some issues with foaming and vapor and etc.....
Side Note: Does anyone know how large the area is that the oil "sits" in? Basically can we back track how much extra "height" is caused by the oil and how much more of the crank hits it while it is rotating.
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I realize 2-3 quarts will increase drag...but 5/8th of a quart won't cost you 5 HP due to the pan/crank geometry (that's my main contention here). Here's an experiment which won't cost you more than the price of a gasket. Take your oil pan off. Fill with 1 quart, then another, then another while keeping in mind the location of your crank (you will have to take into account the displacement of the pump). That will give you some idea what minimal effect 5/8th of a quart will have on the engine's operation.
As for the "study" that was previously quoted which said 10HP was lost (which I disagree with in the first place) when an engine was overfilled 1 quart. Hence the 5 H.P. lost with approximately 1/2 quart extra idea. It's not a linear function.
As to the original poster: don't fret.....you will be perfectly fine. Although this is another lesson why it's best to maintenance your own car. I would imagine that if they refilled with 6 quarts you are slightly above the fill line. Quick lube shops generally only leave the plug out for a few minutes for profit reasons. Several years ago, I calculated how much extra oil I could drain out after the initial few minutes (that the quick lube places are not draining out) and it came to 15% of the sump capacity (but it wasn't a Nissan so take that for what it is worth).
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