I'm a Volvo resto man: http://wagonmeister.com (I have you on my site!)

I'd say I service the cars I restore with Auto-RX about 80% of the time before they leave. I also recommend it to my service customers. Most recently, a customer brought me her 1990 244 to be refurbished. The car was exhibiting some oil loss from the rear main seal. Part of the service included an oil change with our favorite elixir. When the car came back for the follow up about 2000 miles later, the bellhousing and surrounding areas were completely dry, no sign of the leak at all.

Not the first time I've had these results. I've stopped leaks at cam and intermediate shaft seals, crank front seals too. The red block 240s are often plagued with gummy ring packs from lack of high speed use or poor oil change upkeep. This leads to piston slap. Using Auto-RX cleans the ring packs and quiets the engines. I find that following the maintenance routine also keeps the Volvos' flame trap system clear, very important in these cars. A restricted flame trap can increase crankcase pressure causing leaks at seals and gaskets.

I run ARX in all of our cars as well and I'll usually do a full service once a year. Great stuff!

Dave, the Wagonmeister
David Samuels