Yet another Rotella question

McMXi

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My original post is merely asking for feedback on what others here prefer (T4/T5/T6) - it's not about the cost.

50 to 60 hours annually
If cost isn't a concern I don't know why someone would choose conventional oil over synthetic. How are those 50 to 60 hours accumulated? There's a big difference on engine wear and oil condition for a tractor that's run for 8 hours a day for a week compared to one that's run for 10 minutes every day for a year.
 

hedgerow

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Andreas You have been using T4 in your other tractor I would use it in the Kubota. On this farm I use both T4 and T6. Any thing I have a Kubota engine in on this farm I bought new and its had T6 in it since new. I have three semi trucks and a older JD 4440 and all they ever had in them is conventional oil so they get T4. The rest of my farm fleet JD tractors, combine and such have always had synthetic in them even though most I didn't buy new but know they had synthetic in them since new. They get T6. A friend of mind has a JD 4440 tractor that has 25,000 hours on it. It runs every day of the year feeding cows and hasn't been overhauled yet and has only had T4 in it. His dad bought it new in 1979. They service the tractor well and its heater is plugged in when not in use in the winter.
 
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GeoHorn

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Plot the actual viscosity curves for 10W30 and 5W40. You might find it revealing.

Grade 5W40 covers the extremes of all of Kubota's viscosity recommendations including "all-season" 10W30 in a single oil and does it better.

View attachment 165915
Yeah Yeah Yeah. WE ALL know that. But if YOU have a NEW TRACTOR….with a Warranty….WHY would you try to “outsmart” the OEM and give ANY excuse for them to deny?

GM had a series of autos in the mid-80‘s in which the Owners Manual specified 10W30 and when clever owners substituted what THEY thought was equal-to-or-superior…. they discovered the engine damage was Denied Warranty.

Just sayin’…. if it’s YOUR machine…. YOU get to choose…. but getting on a internet forum to accept some anonymous ”username” s advice as … equal-or-better ….is foolish when the OM directly specifies something else, IMO.
 

TheOldHokie

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Yeah Yeah Yeah. WE ALL know that. But if YOU have a NEW TRACTOR….with a Warranty….WHY would you try to “outsmart” the OEM and give ANY excuse for them to deny?

GM had a series of autos in the mid-80‘s in which the Owners Manual specified 10W30 and when clever owners substituted what THEY thought was equal-to-or-superior…. they discovered the engine damage was Denied Warranty.

Just sayin’…. if it’s YOUR machine…. YOU get to choose…. but getting on a internet forum to accept some anonymous ”username” s advice as … equal-or-better ….is foolish when the OM directly specifies something else, IMO.
Just more FUD and the graph speaks for itself. Rotella T6 0W40 is nearly identical to Rotella T6 10w30 and a perfectly fine akternative with a bit better viscosity at the extremes. Nobody is ever going to claim it voids a warranty..

Kubota's listed viscosity grades are a guideline based on ambients not a requirement. The warranty requirenent is for a heavy duty diesel engine oil conforming to API CK4 specifications.

Now just for fun go find me a API CK4 heavy duty diesel engine oil in Kubota's recommended SAE 2O grade. Thats a real Unicorn that would be tasty basted with @hagrid salad dressing

Dan
 
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