Any truth to the rumor that some c5's came with ls 6 blocks, and ls 6 intake manifolds, and that this set up would cause cause higher oil consumption at rpm's above 3000?.

 

Yes...…………….

Oil Woes
Many late 2000 thru 2001 Vette's burn a lot of oil when the engine is kept constantly over 4,000 rpm's. This is caused by ring flutter, which allows extra oil to seep past the oil control rings but doesn't seem to cause any extra wear to the engine. Chevrolet had rebuilt and replaced engines for owners that complained about excessive oil consumption. Their policy was that while the engine isn't normally operated like that outside of racing, it is the owner's prerogative to drive around in second gear all the time if they want to. It was covered under the warranty, however C5s no longer have warranty.

The PCV system also has a tendency to suck oil back into the intake at high rpm's. The newer style PCV system can be installed, but this requires removing all the components in the top of the engine valley. Usually only racer's bother with the hassle. Several generations of PCV systems have had the problem.

All LS based Corvette engines suffer from oil "blow-by" from the PCV valve. This oil vapor makes its way through the throttle body and leaves an oil residue on the throttle plate and intake manifold, that will eventually damage your spark plugs. An oil catch can removes that blow-by and keeps the engines internal components free of this unwanted oil residue and extends the life of your sensors, spark plugs, and manifold. Several manufactures make catch cans and they are relatively easy to install.

The oil-sucking problem will also cause carbon buildup in the cylinders. The dealership sells GM Top End Cleaner, or you can buy SeaFoam from many auto parts stores. The Top End Cleaner is not available in some smog states like California. Run a tube from the bottle into the hole for the PCV system behind the throttle body on the passenger side. Start the car, then start slowly sucking the solution into the engine. Don’t go too fast or the engine could lockup. As soon as the solution is gone, stop the motor for at least 4 hours, but preferably 12 hours. Be aware that when the engine is restarted, there will be a LOT of smoke!

 

Wow very informative! Thank you.

 

I can't take credit for it.....it is part of a stickies listed above!

 

2001- 2004 Corvettes came with the LS 6 intake manifold.

 

I had read somewhere that only the '01 Z06s were effected by this issue...

 

I can verify that it is not limited to 01 Z06's. Since I track my car often I have to run 2 catch cans, and the amount of oil can get filled up pretty quick over the course of running a few of these events! Come spring I plan on shooting a video to see just how much oil I'm going through.

 

All LS1/2/3/6/7/9 engines burn oil when rpms are kept high. LT1 engines in the c7 I know for a fact suck major oil as well. These cars should have oil catch cans from the factory.

Its a joke among the tuner crowd that every time you rev an LS engine you add a quart of oil.