Originally Posted By: BuickGN
Originally Posted By: Jim 5
I used a heavy weight 0w-30 HDEO (XD-3) in my wife's 3.2TL. The UOA was really very good. Terry Dyson told me to stop using it because there was too much phosphorus (an HDEO issue). The weight was not a problem. There was a very good UOA on a 5w-40 in a honda 3.0L v6 a number of years ago.
These engines are spec'd for up to 5w-40 in other parts of the world if I can believe what others have said here on BITOG. Incidentally, I find this quite believable.