There are a ton of these products (mechanic in a can) on the market. Of the lot, these two do exactly what is written on the can.
One of the issues that pops up when you decarbon piston tops/intake valves/ combustion chambers is that once that stuff starts flying around, it can land on plugs and cause a fouling condition, felt as an engine miss. That is why you should always run the vehicle HARD for 20-30 mins after treatment. Gets the plugs hot, which will burn off the loosened materials, and will allows a clean out of the chamber itself. Poor quality fuels, extended idling and short trips accelerate the build up.
A good old hard romp for 15-30 mins every once in awhile helps stop this stuff from forming in the first place. Commonly referred to as an "Italian Tune up", as cars from the '60 and '70's from Italy were notoriously over carbed to make hi RPM performance, but ran WAY too rich at part throttle and idle. Too much unburned fuel causes carbon build up that requires a spirited wide open throttle run weekly to clear the plugs. This means it is good to run our little SAV beasts hard once in awhile.
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2005 X5 4.8IS
The
Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green