They didnt start using the large filters until 2000-01ish, so cars before that have a couple years of running small filters on them and at risk for some possible build up.

 

Any 1.8T A4 engine is subject to loosing oil pressure, large filter or small.
I do just as many sludge repairs on a B6 A4 as i do on B5's.
Using what cincyTT said will help out, but i don't think you could ever get away from sludge in the A4from my experience.

 

Bump for the newbies

 

so if the low pressure oil llight ever comes on...im towing this bitch!!!

 

Most definately.Un-less you wanna be like AMZE and get a new engine.

 

My car runs cool at speed, it's stop-n-go heavy traffic and heat soak that heats it up. Maybe longer running breaks away particles but it doesn't heat up for me.

I've seen several 150K+ 1.8t's that are fine. Read about more that are fine. Honestly, I don't agree that it will happen to every 1.8t. I haven't seen it in my personal experience on high mileage 1.8s.

Sludge may or may not happen but your statements are unclear and contradictory.

following your theory, wouldn't seafoam just break loose alot of crap to get caught up and clog vital lines? I like your preventative maintence ideas but the doom n gloom is [:'(]

 

Seafoamwill disolve the sludge and move it to the bottom of the pan to be drained out shortly after running it.

 

Every time I read this thread I pee my pants a little.
I gotta do a seafoam treatment at my next oil change.

 

you better start putting on some depends before reading the forums next time.