Originally Posted By: MolaKule
Originally Posted By: Trav
I don't see any problem going a full OCI with it unless the engine is sludged.
Have you done a compression test on this engine? Cooling system issues? HG or cracked head? Did it freeze? Carb problem in the secondaries?
It not unheard of for engines that were not properly prepped for long term storage to break rings when first fired up. Not saying thats the case but it does happen.
You have a better idea than i do on the condition of the engine, just a few thoughts.
I would find the bad cylinder(s) via compression checks and then remove spark plug and pour about 5 ounces of LC20 or Rislone Engine Treatment into the cylinder(s) and rotate engine by hand.
I.E., do a piston soak which works the lubricant/cleaner into the rings.
I like Berryman's cleaners as fuel system cleaners but I don't put them in any oil.
Chemtool was forever recommended for use in the oil. They stopped this recommendation due only to misuse by DIY. It had on the can for gas and oil, Walmart shopper buys a can, goes out in the parking lot, pours it in the oil and drives off.
Done at idle only followed by an immediate oil change there is no problem. I have been using this (and in Germany a similar product) since i was a kid (many decades) and never lost an engine or bearing. Driving the car with it in the oil invites disaster.
The problem with piston soaks on V engines is well known. You cannot get full coverage of the piston top or around the rings. L engines are no problem.
The chances of freeing a sticking ring on a V engine through the plug hole is minimal at best.
GM found this out on the N* with its carbon buildup issue. They came out with a can adapter for the Top Engine Cleaner to draw it in through a vacuum line like Seafoam treatment (which are IMHO absolutely worthless). This proved to be more effective than down the plug hole.
The original GM TOC was a potent mix with some acids and very effective.
Chemtool, Kreen, Pro-Tec attack the varnish on the rings from below with the engine running. It is in my experience much more effective in V engines.
I personally performed a test at the Police garage for Pro-Tec when it was first introduced in Germany from England somewhere around 1996.
Warm engine, compression test, throttle wide open 5 sec crank each cyl, numbers recorded.
Protec in the oil 400ml run 20 min at idle, repeat test resulted in 30% average improvement in 2 cyl even more.
This product has a very similar make up to Chemtool with added green dye color.