Engine drinking oi! help!!

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Hello guys,

i have this problem with my engine. it consume A LOT of oil when it is high rev. about 1 quarts for every 10 mins of high rev around 6000rpm!!!

the symptoms:
1. all cylinders are oily when checked with borescope.
2. no blue smoke from tailpipe.
3. Just added an oil catch can. No oil caught after 30 mins run (missing 3 quarts oil!!)
4. this is a relatively new LS7 engine (about 1 year old)
5. valve seal changed recently.
6. compression test done. no issue. will perform leak down test soon.

I speculate that it is the PCV issue. But i cannot explain why i do not catch any oil after missing 3 quarts and why it is no smoke at the tailpipe.
oil used is mobil 1 fully synthetic 5w50.

Running out of idea. Anybody can help?
 
1 quart every 10 minutes is way too much for a simple PCV issue. PCV may exacerbate the problem, but sounds like you got worn valve guides/stuck oil rings or both.

Also...make sure your oil isn't being pumped into the cooling system...
 
clogged oil return holes in the piston can do the same thing, I have been solving that issue on the 1zz-fe forever now, one celica I purchased from chicago and drove it to STL, after 50 miles it was 2.5 quarts low and my spark plugs were fouled up, causing a lot of misfire, I drove the car 20 mph slower (which reduced the RPMs) and the oil consumption significantly reduced. And yes I did top off and changed the spark plugs with another used set I had.

You experiencing oil loss at high RPMs could be explained by that, oil doesn't have a way to return, instead gets burned off.

After fixing this issue, 6000 RPMs all day, no oil loss anymore (except 1 engine which someone honed for me).
 
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Originally Posted By: Rolla07
Worn valve guides?

Or valve seals


Guides. He said he did the seals already. If you have worn valve guides replacing seals won't help the oil consumption.
 
Originally Posted By: 01_celica_gt
clogged oil return holes in the piston can do the same thing, I have been solving that issue on the 1zz-fe forever now, one celica I purchased from chicago and drove it to STL, after 50 miles it was 2.5 quarts low and my spark plugs were fouled up, causing a lot of misfire, I drove the car 20 mph slower (which reduced the RPMs) and the oil consumption significantly reduced. And yes I did top off and changed the spark plugs with another used set I had.

You experiencing oil loss at high RPMs could be explained by that, oil doesn't have a way to return, instead gets burned off.

After fixing this issue, 6000 RPMs all day, no oil loss anymore (except 1 engine which someone honed for me).


Yes very common in several toyota engines, 1mz, 2az, etc. Never heard of this happening with LS series engines though.
 
Originally Posted By: KingCake
Originally Posted By: 01_celica_gt
clogged oil return holes in the piston can do the same thing, I have been solving that issue on the 1zz-fe forever now, one celica I purchased from chicago and drove it to STL, after 50 miles it was 2.5 quarts low and my spark plugs were fouled up, causing a lot of misfire, I drove the car 20 mph slower (which reduced the RPMs) and the oil consumption significantly reduced. And yes I did top off and changed the spark plugs with another used set I had.

You experiencing oil loss at high RPMs could be explained by that, oil doesn't have a way to return, instead gets burned off.

After fixing this issue, 6000 RPMs all day, no oil loss anymore (except 1 engine which someone honed for me).


Yes very common in several toyota engines, 1mz, 2az, etc. Never heard of this happening with LS series engines though.



Especially a 1 year old LS motor.
 
THAT FIGURES SINCE IT'S A POS NO-GOOD DANG GM...

j/k couldn't help myself the-Eric
laugh.gif
 
A quart for 50+ quarter mile passes doesnt sound terrible.


What do they do overseas? 400 meter runs?


Anyway, cruising at/near redline, seems crazy for a street motor.

How do NASCAR engine builders keep consumption down/low during a 8000rpm four-five hour interval.


Do you 'beef' up the oil control rings? I'm curious...
 
Originally Posted By: Robenstein
No smoke so it has to be going somewhere else besides out the tailpipe.


He's probably got a radiator full of 5w50.
 
Originally Posted By: RFAF
Hello guys,

i have this problem with my engine. it consume A LOT of oil when it is high rev. about 1 quarts for every 10 mins of high rev around 6000rpm!!!
Running out of idea. Anybody can help?


Yes....stop running your engine at a constant 6k rpm....YOU are ruining the engine....it likely wasn't built to operate that way.
...next...
Take the engine apart and have it rebuilt by a racing engine specialists who MIGHT be able to install crankshafts, camshafts, valves, guides and even pistons if available and expressly made to operate under those conditions...
 
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