X2 on what Hatt said.

Most of these cleaners are solvents, and are detrimental to your engine's internals, thus the warning on the back of the Techron bottle to limit the use of it per oil change or to change oil after use.

I have NEVER found Techron to make any difference in the idle or running quality of any CIS car, never. It is a solvent which when dilluted in 15-20gallons of fuel doesn't seem to change much. RedLine has worked on my CIS cars, I've tried most everything, it has a detergent in it. Could just be dilluted ATF for all I know, but it cured idle problems and hesitation problems that are so typical of dirty CIS injectors.

For your oil, if it's really sludged, you should open the engine and clean it out or you risk blocking oil passages with sludge as it starts to break down. Other than that, a good quality oil like Mobil 1 synthetic has been pretty successful at cleaning engines internally as you drive, without harmful solvents.

__________________

Gone to the dark side

- Jeff