Thanks for your responses! I had not smelled coolant in the cabin so did not explore heater core leak. Bubbly oil sent my mind in other direction. Passenger side floor is a little wet. Can't...

OK, 2001 V70 XC, 313K miles, (burns ½ qt. oil every 3K miles), owned since 233K miles. Never overheated on my watch. Now rapid coolant loss with no sign of leak. Cold engine shows no sign of coolant...

Hey ssicarman, I'm having same issue (2001 v70 xc, 313K miles) and wondered about the oil cooler. Have you heard of the oil cooler failing, leaking (only) into the crankcase? Do you know of a way to...