I must say I have not heard of "Redex".

There are some dump in the tank fuel additives that will help if your combustion chambers are lightly deposited or your injectors are just starting to gum up. However, there simply are no 16 oz or less bottle of chemistry that will mix with x gallons of fuel and fire hose and brush clean the combustion chambers during that one tank. Repeating treatments are required. A solvent/cleaner strong enough after dilution to do it in one treatment, is not something I want in my gas tank.

There are some products (including water!) that can be injected via the fuel rail or a vacuum line that will clean the combustion chamber pretty nicely. Typically done at a shop, or there are home methods. Yes the crap will fly when this stuff goes by-by. I wouldn't worry too much about it causing some problem with the new turbine exhaust blades. (Heck you could just keep the wastegate open)



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http://www.fidalgo.net/~brook4/oilslubesfilters.html

Kick, you would never have that problem in a turbo that has an automaaaatic tranny. Just kidding.

Short of a valve job you can read up on some good noninvasive info on sticking valves in the FAQ. If you do use a cleaner additive, change the oil soon after you empty the tank.

http://www.brickboard.com/FAQ/700-900/960_90Info.htm#960EngineWontStartStickingValves

http://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm
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Tom F

If you are “burning the steady stream of oil vapour” with the old turbo, how is an additive going to clear up old deposits when new ones are being formed? In terms of drivability, I have never been able to detect a difference when using a few courses of additives.

92-960, 195 000 km

Chevrons' Techron additive--usually reccomended by Volvo also.