0w-40 0w-50 5w-50. I'm not sure if a 10 or 15w might be problematic for cold starts. I've run 20w-50 on dirtbikes/UTVs/etc but probably wouldn't do that on the Rex. Then again, if OnTheReel ventures down that path, Id probably follow him all the way to a 75w140 and buy my engine and rear axle oil in bulk
Grading system is different so 75w140 gear oil would actually be pretty close in viscosity to a 10w60 engine oil. Slightly thicker. Not recommending it, just letting you know that isn’t as far off as it seems!0w-40 0w-50 5w-50. I'm not sure if a 10 or 15w might be problematic for cold starts. I've run 20w-50 on dirtbikes/UTVs/etc but probably wouldn't do that on the Rex. Then again, if OnTheReel ventures down that path, Id probably follow him all the way to a 75w140 and buy my engine and rear axle oil in bulk
And there we go hahaha!! I'm off to 140w
Good call on the viscosity grading though i 100% forgot about that!
dang now im curious how that happened??!!
In your climate you’re not going to see much of the temperatures on the lefthand side of the chart, so there’s really not as drastic of a difference in viscosity as you may think. For instance the Red Line at 30*C (86*F) is the same as Amsoil at 20*C (68*F). And that trend carries throughout the whole operating range pretty well.
In fairness to my “old self”, I’ve done 14 oil changes in 4 years on this thing, ran samples on 10 of those, and have been an open book along the way on what worked and what didn’t. Obviously taken in that context it wouldn’t make sense to go through 3.5 of these filters a year. But after sampling a couple times through this last interval (and just not driving the truck as much as before), I’m just not going to change oil as frequently as I anticipated even a few months ago. Running E85 exclusively has been a benefit to the oil life rather than the drag on it that some believe it to be. It brought fuel dilution down to nil and everything else like TBN and nitration has looked good.
Yeah, doesn’t seem like Mopar takes overall time in the sump into account, which is interesting considering they call for 6 month intervals. From what I remember my GMs did. Anyway, besides the crazy passage of time between then and now I’m not surprised it still thinks there is 10% left when you look how you operate the vehicle. Most of these OLMs are programmed to be heavily weighted on oil temperature. Both too cold and too hot are calculated into the degradation factor. You probably spend the vast majority of time in the sweet spot, so to speak. Easy on oil.
It's pretty much a combination of "long trip" and "high speed drive". But I suspect that my trips are longer and the speeds higher than what they count on.
I commented quite a bit when that came out. I’ll see if I can find it here. Anyway to summarize I would say the differences between all of them in that test are not substantial, and basically within the margin of error for the RDE method his lab uses.
