Originally Posted By: sdan27
I don't know why people wouldn't use it in everything. It's rated for gasoline engines, easily available. I see VOAs of non-HD oils and the additive package numbers are lower than a UOA I do on a HD oil. Usually it's a little more difficult to find much lighter viscosity than a 10w-30 but that should cover a lot of autos. My Powerstroke used to have a cat till it fell off and the manual called for HDEO.
Yep, as long as the HDEO meets proper API certs (most are only "SM" rated that I've seen....) and the proper viscosity for the vehicle (again....that's the kicker....stuck with 10W-30, 5W-40, or 15W-40...)...
That being said, an HDEO makes a good "summer run" oil IMHO
Or, as mentioned, for use in something that is going to be "sitting", and not driven much.....HDEO seems to be cheaper, at least in my neck of the woods ;P Unless it's just the whole deal with it being in "gallons" (4 quarts....) vs. 5 quart containers
The price point makes it look cheaper
The problem I've heard with the HDEOs, if say, you use the HDEO in an engine that doesn't get hot enough, the engine won't be able to completely warm up the engine oil.....particularly if you throw in a xW-40 in there or something....BUT, the Rotella 10W-30 (silver jug, synthetic blend) looks very appealing to me, with a pint of MMO