Not sure why they are saying this as 5W-30 is a standard oil for P80's. Only thing they may be concerned with is if you clean too much out a worn engine, you can lose compression and performance from that? Also -98? cars had hydraulic lifters I think on all variants. Perhaps there is an issue with c...

It depends if they release a lot of dirt/crusty oil residue they may clog the drains from the lifters. Running products to clean oil systems can either work great or cause a lot of issues on older high mileage cars or even low mileage cars that were run short distances and didn't get really warm. Th...

The engine oil recommendations in the owners manual were based on best practices at that moment in time; oil chemistry has changed, even in the last decade, so it takes some study to find a product for our application. This fellow is a bit...Enthusiastic, but he is a chemical engineer working in bot...

You can remove the radiator fan pretty easily, no need to remove entire radiator.

Could you take photo of the top of the engine, can't see what it looks like where the PCV barb should be on the top.

Post a picture of whole engine bay.
Let me see maf sensor and air filter area.

What says on plastic cover which goes on top of the engine...DOHC or 20v?

viewtopic.php?t=62436

Looks like early B5254FS didn't had that hose for pcv on top of valve cover.

I always find these changes baffling as to why Volvo made so many variations. I learn something new every day reading inputs to MVS. Thanks for taking the time to share your findings.

Neil.

Welcome Finland! I don’t know much about the early FIJ systems so we need to wait for the other folks to wake up in your 1995.