In response to
OPSGuy's
comment from Jun 29, 2009:
I have no experience using this Walmart oil in a tractor or heavy duty trucks... sorry. I personally would not use this oil in a heavy tractor or truck unless I got it in writing from Walmart that it was appropriate for such use. I wouldn't want to run the risk of an engine rebuild over a $25 difference in the cost of oil.
Wish I knew more but I appreciate you asking.
--Bob