Mobil Delvac SHC 524

[Ducati996]

I was given a sealed never opened 5 gallon pail of Mobil Delvac SHC 524. I researched it for possible use in my Scag STHM which has a
Sunstrand pump 15-2180 CW and white wheel motors Model HB12110300.
I found lots of info but it’s difficult to understand.
The recommended fluids are cheap & available I was thinking this may be a good upgrade if acceptable.

90cummins

 

[blufeb95]

What is the regular fluid, is it like 20W50 motor oil, what you have is ISO32 hydralic fluid there, that's like a quarter of the viscosity of 20w50 motor oil at 40C.

 

[Ducati996]

 

[DriveHard]

Series 15 pump.
Here is the tech manual.
https://www.semhidrolik.com.tr/assets/images/PistonluPompalar/pdf/15-Serisi.pdf

best viscosity (not surprising as papers suggest 12) is 13 cSt - this will give the ideal balance of wear and efficiency
Minimum continuous is 9 cSt
Minimum intermittent is 6 cSt

Now if you know your operating temps and the viscosity profile of the fluid, you can make your choices. I have said it before, and I will say it again...the hydraulic oils in consumer turf care are chosen for ease of obtaining them, not for best performance.