I had this same problem on my '99 v70 xc - the expansion tank had a crack, coolant leaked and we could not find where it was coming from. Dealer wanted $1000.00 to take the transmission out to find the leak; I knew better and that they just wanted to make $$$$. Replaced the expansion tank myself ($4...

Have had #4 engine coil changed 3 times and it has gone bad 3 times - what would keep causing this? S80 T6 has 104,000 miles, would a bad spark plug keep filing out the engine coil?