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Hi, by the look of the milage on the cars you are looking at I very much doubt they would need that sort of process as long as the car is run on decent fuel it should never need it I have looked at the process in depth and for what it actually removes its more of a placebo effect, save your money for a decent fuel additive which does the same thing and costs less. Steve.

A prop shaft? The A3 is front wheel drive.

Hi oil pressure is virtually instant it has to be or the big ends will knock, I don't know what milage you have done but if you have never changed the chain/tensioner it is of the old variety, most hydraulic tensioners have a spring inside which holds the position of the piston against the chain for a couple of seconds until the pressure from the oil arrives, VAG in their infinite wisdom chose to use another design which uses a ratchet system similar to a rack on steering, the idea is that the ridges on the piston when the oil pressure drops engage with a small male ridged pawl that sits above it and stop the piston moving back maintaining the pistons position against the chain mechanically, my guess is the pawl on your unit has failed and stripped its teeth away allowing the piston absent oil pressure to go further into the tensioner housing therefore making the distance to engaging with the chain far greater than normal and allowing it to jump, apparently this is quite a common problem and guess what VAG now do an upgraded version with a spring in it. Steve.

Nice mod 👍

Good bit of info this.