Fresh 4.0 with 800 miles. In Mojave desert and will be wheeling in temps up to 110°. Thoughts on T5 15W40 Rotella
Thank you
Thank you
15W40 Rotella T5 question
- Thread starter ALASKANMADMAN
- Start date
Thank you, Yes 10W30 but conditions here are far from the norm as do not have cold start ups and extremely high heat. My main concern is the added zinc etc.
Fantastic oil for my father in law's 7.3 and neighbor's 6.0 diesels.
-Mac
-Mac
It's what I run in my tractors, but isn't it too thick? I have a 2.4, but it was to my understanding the 4.0 had a roller cam. It doesn't. It being so hot in the SW, I think with a flat tappet cam 15w40 would be okay? 40 is a little bit heavier though.
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Take a serious look at the latest Diesel oils , the latest versions aren't that high in zinc, my own rather dated extreme oil recommendation is a straight weight
SAE 30 or 40 .
For the real world just use 10W30 ! A 4.0 will never care as long as it has some oil in it !
I read a study that showed while 15/40 diesel oils are great for the diesel engines they were designed for, they don't have the wear protection of the better synthetic gasoline engine oils and are a poor choice for gasoline engines. The study also showed that off the shelf Zinc or ZDDP additives (not part of the oil's formulation as produced, but physically added by the user) actually worsened an oils wear protection capabilities in almost all cases, so beware of that as well. Due to diesels produced after 2008 with SCR emissions all the diesel oils contain a fraction of the zinc they used to. The study stresses that zinc was not the main factor in an oil's ability to provide wear protection, many of the gasoline oils tested did very well with practically no zinc.
The study also showed that the lighter weight oils actually performed better in wear protection than the thicker oils.
Gasoline engine oils are formulated for higher RPM and tight tolerances, personally I would not run a diesel oil in a gas engine, nor would I run a viscosity not included in the engine manufacturer's recommended viscosities. This is my opinion only, take it for what it's worth but I did do many. many days of research on this.
The study also showed that the lighter weight oils actually performed better in wear protection than the thicker oils.
Gasoline engine oils are formulated for higher RPM and tight tolerances, personally I would not run a diesel oil in a gas engine, nor would I run a viscosity not included in the engine manufacturer's recommended viscosities. This is my opinion only, take it for what it's worth but I did do many. many days of research on this.
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What added zinc? Diesel oils are on par with gas oils now in the ZDDP, but diesel oils are not formulated for the RPM of a gas engine and have too much of a detergent package.
Too thick. Also no extra ZDDP anymore which is why people recommended them for a while. Also different detergent packages.
Are you concerned because this is a fresh engine? If so and you want elevated ZDDP for that reason, then run Valvoline VR1.
Thank you for the info and the research as that's what im doing on multipule platforms. Other then engine wear im dealing with viscosity issues for extramly hot conditions sometimes over 110° My stock radiator is great and thus far hits at 210° as it should but its only had to deal with temprature range of 45-80° so far.
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