I tried the new 10W30 Synthetic Blend Rotella in my truck and i like it very well. Truck ran great on my 400+ mile weekend trip and at 16 bucks a gallon at wal-mart not to bad of a price.
I use Wix, I was a Napa Counterman/Outside sells rep for three years and i have a stack of certs through napa on filtration so im pretty much a napa gold wix diehard.
I've noticed Shell selling the 2.5 gallon containers for us D-Maxers. It's a Synthetic blend as well. I have not bought it since I'm using full synthetic and hesitant to switch back.
I wouldnt use anything under the 15-40 thats reccomended. Do you know what oil actually dose? Pulling a heavy load the crank and other components need the oil to give a clearance between engine parts. A heavy load will cause more strain on a motor and with a thinner oil it could cause internal parts to collide causing friction and :blowup
Pull a 10k trailer for a few hundread miles and see how it goes. Hope you got a warranty :drink
I dont tow with this truck and dont haul much with it anymore either because my trailer is a gooseneck and i didnt want to mess my rihno lining up. I use my grandpaws stroke for that.
10w30 will work fine. The benefit is improved mpg and better cold starts than 15w40. My owners manual says you can use 10w30 from 0-100 degrees. It was actually developed for the trucking industry so I wouldn't worry about pulling loads.
My current fill is Delo 10w30 and so far, the hot oil pressure has been the same as 15w40...
Like I posted earlier, the 10w30 was developed for the trucking industry and we all know they "never pull a load"...
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