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I do have cats and thought maybe those masked some smoke, but then I think of those beaters you see driving down the road just puffing away and smelling burning oil which you know have a factory system and you can still see smoke lol.
Also recently noticed the gas tank bulkhead fitting I added has been leaking which explained the gas smell in the garage overnight. So tossing a match at it sounds entertaining...
Ill bring the hot dogs LOL. Yes i've been behind those cars your talking about. Funny story. i was behind this old toyota corolla from the 80's for forsure. I got next to him and gestured to roll the. window down. He was doing don't make eye contact of road rage situation but finally he gave in. I said i'm curious how many miles he laugh he said just over 400k.1qt of oil a week. he drives it every day. So you got aways to go before you really start burning oil or what ever the *** its doing with it.
Definitely a well documented problem for C5 ZO6. Here is one SB up to 2002, I'm sure it carried over for early 2003 builds.
TSB #01-06-01-023A
Some good advice maybe overlooked. The engine valley cover with the PCV orifice and a baffle mounted on the bottom was used on all C5 Corvette LS6 engines after 2002 and the LS1 in 2004. I had the exact same oil consumption gradually increasing up to two quarts on a track day, then smoke out of exhaust after tight left hand sweeper leading to full throttle, triple the oil collection in the catch can, black soot (more than usual) on rear bumper cover, and black soot mixed with condensation when revved within first five minutes after startup. I removed the PCV baffle and resealed with black silicone sealant, new valley cover gasket, and intake seals. I will say the resealed PCV baffle did improve oil consumption. Back to normal catch can volumes and oil consumption reduced to one quart per track day and no smoke after sweepers on full throttle. More pics and dialogue to follow.
I can certainly investigate re-sealing the valley cover. However in my case, I don't have excessive oil in my catch can nor in my intake which would normally mean it's not PCV related.
We think it is best to get your Corvette to a dealership so they can perform a diagnosis and hopefully find the root cause for any excessive oil consumption. Should you like assistance connecting with them, you can email us at socialmedia@gm.com.
We think it is best to get your Corvette to a dealership so they can perform a diagnosis and hopefully find the root cause for any excessive oil consumption. Should you like assistance connecting with them, you can email us at socialmedia@gm.com.
That is also an option. Maybe they will find a fix vs having to replace/rebuild the motor.
FYI- maybe the baffle on the PVC side valve cover is not draining properly. An updated right side valve cover is available. On deceleration the negative vac in the intake is pulling air from the clean side at the passenger valve cover.
FYI- maybe the baffle on the PVC side valve cover is not draining properly. An updated right side valve cover is available. On deceleration the negative vac in the intake is pulling air from the clean side at the passenger valve cover.
Thanks for the info. My car is a LS6 which does not even pull PVC from the diver side valve cover. I have a PCV baffle within the valley cover to a catch can then to the backside of TB. The PS VC feeds into air bridge before the TB. My can barely catches any oil (at least not proportional to the amount Im consuming.
Just pulled PS cover out of curiosity.
Originally Posted by helga203
Where is the oil going?? Wouldn't that create smoke from exhaust??
You’d think so. But I haven't noticed any. I’ll have my wife start the car later today.
Okay. Im chasing the oil consumption thing also. So just offering up info as I find it. That looks like the passenger side valve cover. Where does the hose on the valve cover go to at the bottom of the pic? That valve cover certainly looks clean! The weep holes at the bottom of the valve cover baffle look clean as well.
This is my PCV routing on a 2004 LS1 which was revised to the LS6 PCV system that I have read was used on the LS6 from 2002. The hose from the passenger side valve cover is the clean side of the PCV system.
Last edited by jlaw1313@comcast.net; Nov 3, 2024 at 12:16 PM.
The oil is going out the exhaust. The cats are doing their job burning up the oil. Also, good synthetic oil burns cleaner than conventional further masking the smoke you would think should be visible.
The oil is going out the exhaust. The cats are doing their job burning up the oil. Also, good synthetic oil burns cleaner than conventional further masking the smoke you would think should be visible.
Sorry that's wrong. Just my experience with many syn oil in engines all types. It only matter on the wear of the engine.
@smitty2919 Oil control rings on the pistons are stuck.
Do a long (48 hrs) piston/combustion chamber soak or two with your favorite solvent..
Then start running Valvoline Restore & Protect 5w30 to keep the cleanup going.
Last edited by donjetman; Nov 3, 2024 at 06:52 PM.
@smitty2919 Oil control rings on the pistons are stuck.
Do a long (48 hrs) piston/combustion chamber soak or two with your favorite solvent..
Then start running Valvoline Restore & Protect 5w30 to keep the cleanup going.
I have come across this as a potential issue also. Would be a cheap thing to try for sure!
Berryman B12 seems to be a popular choice.
Last edited by smitty2919; Nov 4, 2024 at 09:43 AM.
I have come across this as a potential issue also. Would be a cheap thing to try for sure!
Berryman B12 seems to be a popular choice.
My most recent car purchase is a 2011 A4 Avant, in which their 2.0T engine is notorious for oil consumption. Thankfully my A4 isn't consuming any noticeable quantity of oil, but I've been following this topic about using B12 for a piston soak to help liberate stuck / clogged oil control rings: https://www.audizine.com/forum/showt...tion-reduction
I'm curious how piston soaking would work on a "V" engine, vs on the I4 that is mostly upright. My guess is it would be less effective but nonetheless could be worth a shot if all else fails.
@smitty2919 My C5 Oil Consumption Fix:
I bought a stock 02 LS1 coupe w/auto w/60k miles in Feb 23. I don't hotrod it and I use it mainly for long distance hwy driving. Today it has 79k miles.
I quickly discovered it was burning 1 qt of oil every 2500 miles. I installed a Mike Norris Motorsport catch can and a fixed orifice pcv valve, GM# 12572717. The cc has not caught much oil.
I did a piston/combustion chamber soak with Gunk brand motor flush called Motor Medic. The longer the soak the better the results with this product.
Today oil consumption has decreased to 1/2 qt every 5k miles.
I'm now running HPL brand PCEO 5w30 to keep the oil rings, etc clean: HPL PCEO 5w30
I've also had success reducing oil consumption to near zero in our 07 6.2L Denali by improving the driver side valve cover and doing the soak. A catch can install on this vehicle showed the vc pcv was defective requiring the new improved GM valve cover as indicated in GM TSB# 10-06-01-008M: TSB link
My most recent car purchase is a 2011 A4 Avant, in which their 2.0T engine is notorious for oil consumption. Thankfully my A4 isn't consuming any noticeable quantity of oil, but I've been following this topic about using B12 for a piston soak to help liberate stuck / clogged oil control rings: https://www.audizine.com/forum/showt...tion-reduction
I'm curious how piston soaking would work on a "V" engine, vs on the I4 that is mostly upright. My guess is it would be less effective but nonetheless could be worth a shot if all else fails.
I thought the same, I assume most would pool due to the angle of the pistons.
Originally Posted by donjetman
@smitty2919 My C5 Oil Consumption Fix:
I bought a stock 02 LS1 coupe w/auto w/60k miles in Feb 23. I don't hotrod it and I use it mainly for long distance hwy driving. Today it has 79k miles.
I quickly discovered it was burning 1 qt of oil every 2500 miles. I installed a Mike Norris Motorsport catch can and a fixed orifice pcv valve, GM# 12572717. The cc has not caught much oil.
I did a piston/combustion chamber soak with Gunk brand motor flush called Motor Medic. The longer the soak the better the results with this product.
Today oil consumption has decreased to 1/2 qt every 5k miles.
I'm now running HPL brand PCEO 5w30 to keep the oil rings, etc clean: HPL PCEO 5w30
I've also had success reducing oil consumption to near zero in our 07 6.2L Denali by improving the driver side valve cover and doing the soak. A catch can install on this vehicle showed the vc pcv was defective requiring the new improved GM valve cover as indicated in GM TSB# 10-06-01-008M: TSB link
It's definitely on my list to try! Thanks for the background specifically on a LS1. Mine is right about 62K mi.
Originally Posted by acroy
so..... it's still drinking oil?
TBC...I'm just driving it like I normally do and see what happens. If it drinks oil again then I'm going to the soak method as a last resort with Valvoline Restore/Protect oil. Trying to test one thing at a time.
When I did the piston/chamber soak on my vehicles:
1) drain the oil & leave the plug out.
2) pull the spark plugs out
3) squirt in plenty of solvent in ea spark plug hole with a large syringe or turkey baster, etc
4) over the couse of a couple/few days, every once in a while, rotate the engine crankshaft some.
after a couple/few days put a towel or whatever over the open spark plug holes and crank the engine over with the starter to blow the solvent out completely.
Put the oil pan drain plug back in, fill with oil, drive it for a few hundred miles, drain the oil, change the filter, refill w/HPL or Valvoline Restore & Protect, and keep your fingers crossed this does the trick. It did for me
Last edited by donjetman; Nov 5, 2024 at 12:42 PM.
