oil leak- gas mileage... please help!! [Archive] - GrandAmGT.com Forum


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01-05-2009, 07:03 AM
2003 gagt under 80,000 miles, my wife and i recently went on a road trip to texas 2000+ miles on the way back oil light came on and it was at least a quart low. i just changed the oil and it was full.

i know its had a leak around the lim gasket for a while but it was minor never anything like this, other thing is there is never any oil puddles where we park at work or at home. car also only got around 26 mpg on each tank, it usually averages around 30+

only thing recently changed was the t-stat car would not heat up

only mods are custom cai and underdriver pulley

any ideas what could be wrong?

could the lim gasket cause it to leak that much and not have puddles on the ground?



01-05-2009, 12:10 PM
An older engine will burn more oil at higher speeds. Keep a close eye on it and check the level at least every thousand miles.

01-05-2009, 01:29 PM
80,000 miles is not old

01-05-2009, 06:10 PM
yeah i agree

01-05-2009, 10:13 PM
With a gasket going bad, more oil could burn by seeping through the gasket. Usually with a LIM gasket going you get coolant in the oil. Not oil in the coolant. Although it could be happening.

01-06-2009, 01:31 PM
80,000 miles is not old

All engines will push oil through the rings at higher revs. Your 80,000 mile engine might not be old but it's not young either. The rings are going to worn more than a 5,000 mile engine and more oil is going to get burned.

gagt Mechanic
01-06-2009, 07:50 PM
also check your pcv and most likely your rear main is leaking, there is an updated gasket, but it is not a big leak. I have not seen and oil light on at only one qt low. you might have an oil pump issue, prob not an oil pressure switch since Im guessing it went off after you topped it off.

01-07-2009, 07:46 AM
i have also noticed some oil on the inside of the hood by the pulleys looks like its getting thrown us there what would that be the rear main seal?

01-07-2009, 02:01 PM
The rear seal is where the engine connects to the tranny.

01-08-2009, 06:25 AM
thats what i figured, any idea what could be leaking around the belt? cant wait to get this thing on the lift, it probably has like 50 leaks