Can't figure why WRV started using Valvoline Engine oil for the hydraulic pump?
Valvoline premium blue 15-40 is a great oil for the engine, but it is not the right oil for my hydraulic system. When I look in my 2006 WRV owners manual, it does say to use say to use Valvoline Premium Blue motor oil in the hydraulic resvoir. For over 40 years I have had constuction equipment and I never used a detergent motor oil in anything, nor did ever see it recommended in writing. I have used NON detergent motor oil ok and different hydraulic oils.
Here is what I learned a long time ago. You never want to use a detergent oil in a hydraulic system, it can cause foaming in the oil, which will cavitation in the hydraulic pump and result in premature pump failure. Secondly, it could deposit the contaminants as sludge throughout the hydraulic system.
Reading different posts on the forum, it appears there have been pump problems, hydaulic fan motors, and brake stopping problems. The reason I writing this is yesterday, I did talk to a Meritor Tech support person about using the Valvoline motor oil and he said it is not the right oil to be using for your brakes.
I know WRV did use Dextron on the earlier coaches and I never had a problem in 10 years on my 2000. When I got my 2007, it had cooler failure, and dealer replaced the Valvoline with Dextron and everything worked fine. I did change my fluid to the Chevron Rando HDZ ISO 46. What I read on the forum, some of you use Rando and some are using the 15-40. The problem with the Rando is getting it. None of the Chevron distributors stocked it, so they ordered it from the factory. In my opinion if you don't want to use or can't get the Chevron, you could use most any other hydraulic oil or dextron. You probably should flush out the 15-40 first. I would think for sure the brakes would work better.
I know oils have made a lot changes over the years, but the Premium is still a detergent oil. The pumps would still foam up the detergent oil. I wouldn't use it in my hydraulic system. Maybe somebody could tell me why WRV thought this was the right oil to use.
This just my opinion and I am sure there will be other comments!
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