HDM Oil? Whats the difference

[TheGreyRider]

So can anyone tell me what the HDM stands for in HDM SAE 10W40 oil? And is that the same as standard 10W40 oil?

 

[thatguy]

google only finds your post and one from yesterdays tractors regarding motor oil..

free bump for answers..

my guess is going to be Heavy Duty Motor.

brian