View Full Version : What happens if you run too much engine oil?


BrianMSmith
11-16-2008, 11:55 AM
JIffy lube put 3/4 of a quart too much oil in my wife's car, takes 5.5qt and they put 6.25qt in the engine. She drove it about 100 miles before I caught the error. We took the car back to jiffy and had them drain it out.

Car runs fine, but how would I know if there was any damage to the crank seal or anything else? What is the root cause of problems due to too much oil..oil pressure too high damaging seals/bearings?

This is a 9k mile brand new engine and I need it to run 250k miles, I am now concerned that this stupid error has compromised the engine.

69BirdX
11-16-2008, 11:59 AM
It can push out seals but i wouldnt worry to much if there isnt any leaks and prob didnt do any damage.

Ice78Transam
11-16-2008, 12:06 PM
3/4 quart didn't do anything. All it did was reduce fuel economy because of drag on the crank. I used to overfill my Honda intentionally by almost a half quart. Did that for 20,000 miles and totally ran perfect. Every time the motor was out it looked great.

95TAJade
11-16-2008, 12:39 PM
I use a full 6 qts, in my car just so I don't sit on half a quart for 3k miles. no problems with fuel economy or power...now needin a new clutch...that's the only thing keeping me from going fast:( Where's Scoggin Dicky when I need a deal:D

Ice78Transam
11-16-2008, 01:19 PM
Where's Scoggin Dicky when I need a deal:D

Truth. They rock. Also look at gripforceclutches on ebay. THAT guy is the tits.

the_merv
11-16-2008, 02:12 PM
I always add a little extra cause mine will burn some of it..lol

teke184
11-17-2008, 08:25 AM
other than the seals issue, the big problem with overfilling is that every rotation of the crank basically slaps the surface of the oil.

assuming it's filled THAT much.

but i wouldn't worry to much about it.

the_merv
11-17-2008, 10:43 AM
I think alot of you guys are forgetting to factor the Windage Tray into play..

I don't run one, but just about every factory Engine would have one..

SparkyJJO
11-17-2008, 12:02 PM
Truth. They rock. Also look at gripforceclutches on ebay. THAT guy is the tits.

Say what?? :jest:

ErikElvis
11-18-2008, 01:34 AM
All those shops are notorious for overfilling. I dont trust anyone doing any oil changes. 3/4 of a quart I wouldnt worry about. Im sure it didnt do anything.

KENS_SS_4
11-18-2008, 06:46 AM
Any problems due to high crankcase pressure would have shown up right away. So it was not overfilled to the piont that causes damage. This is not something you want to find out where the tipping point is.

RPM WS6
11-18-2008, 07:18 AM
6.25qt in an LS1 is no problem. I always use 6qt. IIRC, you can run up to about 7qt and still not be touching the crank.