This is more of a preventive measure because my A4 has 190,000 miles. I bought it at 185,000 so i am doing all maintenance possible even if it dooesn't need it including: oil changes, seafoam, techron, fuel injector cleaning, fuel pump, and fuel filter. Other then seafoam, what is the best product for putting in the oil to clean out any possible sludge. Im thinking auto-rx, is that safe for audis? What is the best product?

 

Auditech79 posted a thread in the stickies up top about something he used when working for Audi. It's more of a sludge fix than a preventive measure from the sounds if it though, and it's not cheap. Honestly, dump half a cup of Seafoam in your oil for the last 100 miles before you change your oil, let the turbo cool without boost at idle for 30 seconds or so before each shutdown, and you should be fine.

 

i started with the seafoam treatment as recommended above. really didn't notice too much of a difference but I really didn't follow the exact procedure as recommended. It is one of those things that works "slowly" over time. the more times you do it, the better results you will get. that doesn't mean do it ten times in a row, just every time you get ready for an oil change.

I actually tried the auto-rx treatment. it seemed...ok. Loosened some of the gunk around the oil fill. if you go that route, definitely do a short cycle oil change (1K miles) with high quality filter so if any "clots" get knocked loose, they get cleaned up. I will say that my gaskets started leaking after the auto-rx treatment so...coincidence? possibly.

so...there's that

good luck