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That's kind of the point with an oil like this, take the guesswork out. Will this additive work with my oil, etc. you run this stuff, it cleans the motor, you walk away happy.
As to when you'd use it, I can think of 2 off the top oft my head. Case 1) purchase of a used car where you want to clean the engine for whatever reason. 2) dirty piston rings. A buddy has a Q7 with the supercharged V6, and it burns tons of oil due to a design flaw where the piston rings get carbon build up on them and no longer are able to rotate, causing oil blow by. This oil in theory could free them up and resolve the issue, maybe.
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