I use 5w-40 Rotella T6, but I don't have 500K on the clock.

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IMO, there's honestly no reason not to switch to a good quality 5w-40 synthetic, especially in a cold climate. No matter the mileage. They run at the same viscosity when hot. I suspect you'll even notice slightly less injector noise with a 5w-40 synthetic. Rotella, Mobil 1, Valvoline and others all have very good options.

 

The Deere oil is over kill in a pickup truck, same for the other off road manufacturers (the Red and Blue guys)
the Rotella is a commercial grade oil, you would have to step up to Rimula to be equivalent to the Green, Red, and Blue oils
nothing wrong with running better oil, just the cost

The 5W-40 will help the truck start better, same for your heavy equipment
the Red guys(and I suspect the Green guys) have synthetic oil if your a mind to stick with those
a lot have used the Rotella T6 and had good luck with it in a truck

 

The Deere oil is over kill in a pickup truck, same for the other off road manufacturers (the Red and Blue guys)
the Rotella is a commercial grade oil, you would have to step up to Rimula to be equivalent to the Green, Red, and Blue oils
nothing wrong with running better oil, just the cost

The 5W-40 will help the truck start better, same for your heavy equipment
the Red guys(and I suspect the Green guys) have synthetic oil if your a mind to stick with those
a lot have used the Rotella T6 and had good luck with it in a truck

I like the Deere oil because its a superior product. Nothing works harder than a tractor out in a field on a hot day. I don't mind paying more for a better product. If I switch I'll go with the Deere 5W-40 or the Motorcraft I think. I just hope it doesn't go through seals / gaskets and past the rings. I've got a lot of miles on it.

 

Did you know that the oils Ford recommends are synthetics?? Which means the old school thoughts of leaking seals when switching to synthetics are not a concern with modern trucks as they were 100 years ago.

 

With 500k on the clock, we should be asking you!! I will soon cross 200k.

I am a fan of ROtella T6 which until recently was 5W40. More often than not, the T6 is becoming available in 15W40 only, so I am switching to that.

One of the things that hold me back from a new truck is I can‘t do what I like with a truck I’m making payments on. Too afraid to scratch my new toy driving it down a dirt trail.

 

I think you’ll see positive results switching. I would stay away from the motorcraft oils though, they consistently test at the lower end of the spectrum. The old leaking after switching tales were from the older formulations of synthetics that’s no longer the case. My old 6.0 and my wife’s tdi Jetta are at over 500k miles on T6 and no issues to speak of.

 

500k and you want to switch oils?

I wouldnt change a thing if i made it to 500k without a rebuild.

 

Been running Motorcraft oil for over 176k now....no issues.

 

I always used 5W40 in my 6.0 to cure cold loping idle. Never had an issue with oil analysis. I use Rotella T6 in my 6.7 since first oil change. Clean oil samples. I swear by synthetic especially in colder climates. They are superior in every way and don't cost that much more than regular oils. You can usually find it in 2.5 gal jugs for around $46-$50.