[toates89]

I just lost a quart in 150 miles with no smoke or signs of leaks.


Any ideas?

 

[djb383]

U may have mis-read the dip stick, either 150 miles ago, now, or both. Virtually impossible for a quart to disappear thru the cylinders without smoke. If u check the dip stick after the motor has been off for several hours and then the next time u check it right after turning the motor off, there will be a substantial difference in the 2 readings. It's always best to check the oil level after the motor has been off for a while, thus allowing the oil time to drain back to the pan for a more accurate oil level reading.

 

[Joe canyon]

The 3.7 takes 6 quarts for an oil change with filter. Do you have the oil changed or do you do it ?

 

[08Canyon]

I'd suggest monitoring it to ensure you are getting accurate readings. No visible cause and the sudden change leads me to think it was a bad reading.

 

[rshadd]

It's either leaking it or burning it. You sure you added six quarts?

 

[toates89]

U may have mis-read the dip stick, either 150 miles ago, now, or both. Virtually impossible for a quart to disappear thru the cylinders without smoke. If u check the dip stick after the motor has been off for several hours and then the next time u check it right after turning the motor off, there will be a substantial difference in the 2 readings. It's always best to check the oil level after the motor has been off for a while, thus allowing the oil time to drain back to the pan for a more accurate oil level reading.

You may have hit the nail on the head. I let it sit for hours and the reading is fine but the owners manual says to check with warm oil. I might have been on a slightly uneven surface as well.

But for peace of mind I am going to pull plugs and check compression as I have lost 2 cups of coolant in the last 6 months(saw some dripping from the overflow hose). Cracked heads scare me.

 

[Newcoly]

how many miles on the truck?

 

[toates89]

110k

 

[08Canyon]

So if the oil readings were different from one time to another, I'll say it again. Now you have to ask yourself if you have overfilled the system by adding oil due to a potential inaccurate initial reading.

 

[toates89]

So if the oil readings were different from one time to another, I'll say it again. Now you have to ask yourself if you have overfilled the system by adding oil due to a potential inaccurate initial reading.

I already picked up filter and oil going to go home and start from scratch.

 

[07ColoradoBLK]

i lose a 2.5 qts after 4000 miles.. last two oil changes its about 1 quart loss after 2800 miles. then runs like shit til i change the oil. well i mean it runs like shit everyday its a big piece of shit truck honestly.

 

[RidinBaseline]

i lose a 2.5 qts after 4000 miles.. last two oil changes its about 1 quart loss after 2800 miles. then runs like shit til i change the oil. well i mean it runs like shit everyday its a big piece of shit truck honestly.

:lol2:

 

[1BADI5]

Check your oil when the motor is cold and on level ground. This will ensure you get the most accuret reading

 

[Joe canyon]

Check your oil when the motor is cold and on level ground. This will ensure you get the most accuret reading

I agree 100% ^^^^. Yet the owners manual says for an accurate reading check the oil when engine is warm lol. Why would someone let the engine warm up to operating temp to check oil when they think is low. I'll check it as needed GM and it doesn't matter if warm or cold.

 

[Supermodulation]

Hmm I have heard of this problem before. A member down in TX had a similar problem.
Unusual amount of engine oil loss.
He found one side of the valve cover vacuum crank vent was completely clogged with debris.

Have you inspected your tb, vacuum hoses or heavy soot on the exhaust tail pipe?

 

[IanDV]

I agree 100% ^^^^. Yet the owners manual says for an accurate reading check the oil when engine is warm lol. Why would someone let the engine warm up to operating temp to check oil when they think is low. I'll check it as needed GM and it doesn't matter if warm or cold.

I also change the oil 3 or 4 times before the oil life indicator turns on.

 

[TurboradoI5]

oil might be going thru your cylinder little by little without signs of smoke or also check the water on the radiator it might be leaking to your water system. if so change head gasket and refurbish the head and change all gaskets

 

[toates89]

Just a update to the issue. I think it was a combo of misreading the dipstick and oil being thinned out from short cold winter trips and burning off. Once the weather broke it was fine. Then it blew.

 

[t-bone]

Not to thread jack but my 2.8l did that too I went in for an oil change I went over like 150mi and the guy told me I didn't have any oil touching the dip stick
It has 93xxxx on it

 

[1BADI5]

Mine will displace about .5qt every 4000-5000miles