Slowly going through a series of issues with my 2003 Aero estate, which I want to hold on to for some time.
The PCV issue seems to have slipped through my fingers - despite having a full Saab SH, the latest PCV mod has not been done - no T-piece on the filler neck. Incidentally the car was serviced in Germany in 2006 - about the time of the last release.
When doing the research before buying the car, I understood that Aeros generally don't have the sludge problem because they had fully synthetic since new - it was a factor in choosing an Aero (and paying the premium) above other variants.
Having now read through the Angry Kitchen Appliances info. on the early PCV mods, it worries me that I have purchased an engine with inherently flawed crankcase ventilation, and only the last of the line, MY2004 engine mods sorted it.
My car has had oil changes every 6-8000 from 20000 miles, which I guess helps matters.
Main question is, what urgency would others put on doing the PCV mod? I have an oil change to do in the New Year.
The car does use a little oil (maybe 250ml every 6000 miles).
Two other related questions.
1. I don't understand the exact relationship between crankcase ventilation and sludge build up - could someone explain?
2. In the Angry Kitchen Appliances website diagrams, the valve cover gases can go either into the throttle body, or into the turbo inlet pipe. I take it in the latter case, they are not burnt, but exit through the exhaust. I don't understand - I thought the system was there to contain emissions, not dump them to atmosphere.