I'm about to do this on my V70. Wondering if you could just use air in the cylinder to hold the valves closed. I have an air fitting I welded to a spark plug I blew the ceramic out of. compress the vlave spring and take the keepers out. then replace the seals. seems like it should be way under 12hou...

Hmmm. I worked my way through college at an auto shop. I've done tons of "Power Flushes" and rebuilt transmissions both auto and manual. What I have read is sounding like its not based on fact. 1st...When synthetic oils first came out they did have problems eating seals...No longer a probl...