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This is one of those subjects with a lot of opinions that very wildly, and this is mine: don't use that stuff.
For some reason the 3,000 mi oil change interval remained popular in the USA, perhaps the whole of North America. If you too adhere to that, you're changing the oil 3x more frequently than necessary and IMHO you're basically already flushing the engine on a continual basis.
The official engine oil change interval for the 1992 model year is once a year or every 15,000 km (9,321 mi) whichever comes first. It's half that if the car is run under difficult conditions for long periods of time.
I adhere to the normal 15,000 km interval and I have not yet seen any kind of sludge build-up.
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