My 2005 Unimog U500NA owners manual calls for 10W hydraulic oil in the hydraulic system. The hydraulic system powers the rarely used winches, but also the radiator cooling fans. Low stress but constant use.
Mobil’s 10W hydraulic oil has a vis40 of 37.7. I live in Anchorage which can rarely get below -10F. Don’t use truck much in winter, but winches might be used to pull someone out of ditch.
Most use is in warmish places; may be in Kalahari 2022-3 southern summer.
System takes 45L. Right now has mainly Delvac 1 LE 5W30 which has vis40~70 (close to 68).
Right now I have 2 unopened buckets of Mobil DTE 10 32 viscosity. Very good stuff with high VI.
Should I return it for same stuff 46 viscosity? I am hoping dropping viscosity to the proper range would improve fuel economy 1 or even 2%.
PS local jobber doesn’t stock the 10W stuff and it has comparatively crummy VI.
Mobil’s 10W hydraulic oil has a vis40 of 37.7. I live in Anchorage which can rarely get below -10F. Don’t use truck much in winter, but winches might be used to pull someone out of ditch.
Most use is in warmish places; may be in Kalahari 2022-3 southern summer.
System takes 45L. Right now has mainly Delvac 1 LE 5W30 which has vis40~70 (close to 68).
Right now I have 2 unopened buckets of Mobil DTE 10 32 viscosity. Very good stuff with high VI.
Should I return it for same stuff 46 viscosity? I am hoping dropping viscosity to the proper range would improve fuel economy 1 or even 2%.
PS local jobber doesn’t stock the 10W stuff and it has comparatively crummy VI.