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I don't recommend 15w40 but if that's the way you want to go i would use a non synthetic rottela. I use 10wt hydraulic oil that has Alison approval on the bucket. Sent from my SM-G930V using Tapatalk

Pretty sure it is the heat, like Simp said the dex type fluids don't like temps over 180 and these trucks were designed to use the 10wt and normal temperature of 210 or more which is fine on 10wt or most hydraulic/ transmission oil. What everyone needs to remember that these trucks were designed...

Here's the biggest reason to stick with what you have, half of the people I have talked to about changing thier 5 ton out to the tes 295 have had the transmission fail after changing. They have enough money that they said they were going to do it anyway and they had to replace the transmission...

Thanks Simp and it is not 15w40 that was used in 99% of these trucks it is 10wt engine oil that they were all built with. The 15w40 was a change in the manual and didn't get done to most of these trucks. RSMS even used 10wt whe they were doing complete rebuids up through 2013. Sent from my...