Can I blend 30Wand 50W transmissin oil?

Messages
8
Location
SE Oklahoma
I am replacing oil in a Cat 85 transmission. 50W will meet the recommendations for summer use (95degrees). However this is a little heavy for winter use. Can I mix 30 and 50? I will use Chevron oil. Is there another option? BTW 40W has to be special ordered and would be hassle. Trying to use oils that I keep on hand.
 
Messages
386
Location
West Virginia
Usually 30w is fine for summer use if it is a to-4 rated fluid. It just depends on what your service manual calls for. I would not mix the two weights if it was me. If you want better flow in the winter with a sae-50 tranny oil then go with Amsoil full synthetic tranny hydraulic oil if your manual will allow it. That is a excellent product.
 
Messages
3,316
Location
Bolivia
no problem with mixing same brand 30 and 50. The overlap in operating temps usually work, but not always. Here I have to use a 60wt TO-4 sometimes
 

cattracks

Thread starter
Messages
8
Location
SE Oklahoma
Thanks for the responses. I am using Chevron drive train oil and not Cat oil. Does blending the two at 50/50 make a 30W50 multi-viscosity oil, or does it make 40W?
 
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