Thanks for the follow up!

I have probably logged 99% of my repairs in my 1999 T5 maintenance log here https://www.matthewsvolvosite.com/forums/viewtopic.php?f=35&t=57678 And the threads on the switch 9447804 is here https://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=55868&hilit=1999+v70+t5&start=10 ...

I did 5000 mile OCI Castrol Dino oil on my T5 for most of its life , at 160k the PCV was clean and unclogged.

I switched to synthetic And run 7500 miles now

1999 Chassis break info per FCP

I'm guessing the boost levels have a big impact on sludge buildup. I drove my car for a year with the turbo hoses wrong and didn't notice. My friend in Florida, diplomatically, may boost more.

I just hit 5000 on my Mobil 1 high mileage and might run Blackstone on it to see how it looks vs 7500.

Bruno..that could just be the solenoid chattering due to low voltage

Middle aged? Is your Mom still driving ???

The 850 interior is much nicer aesthetically, my charcoal 99 withfaux metal trim is warmed nicely if you are lucky enough to have the wood grain. I don’t have that. Turbos have three hoses that are colour coded. Pretty easy to get right, although a very good friend of mine drove his for a year with ...

Users Yagger and doublebug are the guys go to for this , about 1/4 the cost of dealer and done at any place with internet, of course

This is crazy. Really it is $5.20 per 2,500 miles if you are using full synthetic oil like Mobile 1. I'm sure you are wasting gas or something more than that? Ratnalle called this one earlier. He pointed out my 30 mile hot run arguably costs something like $10-15 minimum so Im truly stupid focussin...