Originally Posted By: TheBig2003
Originally Posted By: OVERK1LL
Originally Posted By: TheBig2003
Best at removing sludge with no damage to engine for me has always been Pennzoil/Quaker State drop in engine flush, run for 7 minutes and then drain overnight. Next morning fill with Castrol Syntec, but now I use Pennzoil Ultra instead of the Syntec. Never had an issue and valvetrain and internals are spotless with absolutely no wear.
If the internals are spotless, then how do you know it was removing sludge? Those two statements sort of contradict one another.
Well, I purchased a 2006 Pontiac Grand Prix GT S/C with 84,000kms on it, pulled the valve covers because the gaskets had blown - common problem for the 3800. Nice sludgy situation was going on there, I changed the gaskets and followed my plan.
This spring with 92,000kms on the engine, I tore the engine down completely because I was changing the rockers, bearings, springs, pushrods, camshaft and valves because I was increasing compression on the supercharger and everything was spotless when I removed them this spring.
Brought to a buddy of mine who owns a machine shop - everything was within GM specs - BEAUTIFUL. That's how I know. Not exactly contradictory is it if that's the case.
Explained completely, it makes a lot more sense. Thank you for taking the time to do so.