I just bought a used 4310. I want to change all the fluids so I know what I have. I went to the dealer and they sold me the 2 hydrualic filters, 1 oil filter and 10 gallons of UDT. I mentioned that I had several gallons of 15w40 rotella semi synth at home. He said that is fine, run any diesel specific oil but only run kubota UDT in the hydraulics. So I get home and realize that the manual calls for 10w40 in these temps. Crap! Winter is coming, will I be fine with the 15w40. Temps here can get down to zero. Tractor will be stored in a heated garage but will be used for snow removal. Did some searching and found the usual doom and gloom about what oil to use and not to use. Just want to make sure I am not making a big no no by running this oil in extreme cold.
here is the part of the statement that will save ya !!!!
In a heated garage ....... so lets say it is 5 degrees outside - your tractor will have a balmy temp of something like high 50s or better. Since it will ONLY get hotter - the cold will not be a problem since the oil will be "warm" once you start using it!
there is a difference between 10 weight and 15, but for your purpose there really is no reason to change over - the 15 will pour a little slower than the 10 - but at the startup ( were 90% of wear occurs) the oil is already "ok"
If you were to leave your tractor outside and the temps get down in the single digits - I would switch - even get 5 w .......
When winter hits, start your tractor - crack the garage door, let her warm up a bit, and then go for de snow!!!!
You could also get a block heater, but then again the whole garage is a heater!