Hydratrak differential - correct oil?

[Naybr]

Anybody know what is the correct type of oil for the optional Hydratrak diff?

[darkcat]

I beleive its 75w140 ish

[Pupp]

you sure it's a Hydratrak?

[Naybr]

No - I'm not certain. But the original sales invoice lists it, and it has grooves in the driveshaft ends which I'm told is the way to tell it apart from the BTR.

[macdeb]

Be careful, if it's a Chimaera I doubt it has hydratrak though a very few have. Correct oil is crucial and I had this same dilemma a while back when I suspected mine had hydratrak. [it didn't] There is a way you're supposed to tell if it is BTR or Hydratrak and it involves the lifting of both rear wheels and from memory if it's a BTR when you turn one wheel the other also turns smoothly with some resistance, and if it's hydratrak you will feel a slight juddering when trying to turn the wheels or something like that. I'll have a look back in my notes and see for sure, unless someone can confirm on here before. Hope it makes some sense