Originally Posted By: BrocLuno
And the next article down states:
This is especially true in HDD applications, where over 80% of end users use solely SAE 15W-40.
I been saying this for years. 15W-40 is the standard among fleet operators. Even those using LPG, Gas and Diesel mixed fleets... It's been the go-to oil for so long, that it will be a rude awakening for lots of fleets when the new stds come out ...
some truth to that, except for the last couple of years, the heavy diesel OEM's have been factory filling with 10w30, recommending it, and many fleets are switching to it. I moved my semi over to 10w30 and pleased with the results. The only reason many of these types of users view 15w40 as the standard centers more around standardization in the shop and resistance to change, which is very common in trucking operations. It sure isn't because many of these fleets and owners are savvy about what they are using. You walk in to the majority of shops and they couldn't give you a technical reason why they using a 15w40. Just the pat "that's what we have always used" type of responses. Don't even ask them about such things as NOACK. You will just get a glazed, confused look.