I used a Kubota oil filter and 2.1 quarts of Mobile 1 Delvac synthetic 15W-40 oil. I've been using the Mobile 1 Delvac synthetic oil in all of my diesel products for years. On most any diesel engine discussion board you will find that about 90% of the people, including the leading diesel repair shops, exclusively use the Delvac oil. It is one of the few motor oils that is specifically made for diesel engines and states as much on their packaging.
Mobil 1 Delvac has one of the best reputations there is when it comes to synthetic oils. It is a true group IV fully synthetic oil. Many an oil analysis has come back on diesel trucks after 10,000 miles with the statement "engine oil within spec OK for continued use recheck in xxxx miles". Usually the only recommendations are to change the filter, add the difference to make up the loss from the filter and recheck later.
With that knowledge, I still change the oil in my truck every 4000 miles and in my tractors every 50 hours. I've never had an engine failure, nor has anyone else who uses the same time and oil changes with the Mobile 1 Delvac. Now some of the farmers around me tell me that it is impractical to change their tractors oil any more often than every 100 to 200 hours (depending on the farmer), but when using the Mobile 1 Delvac, they have put thousands and thousands of hours on their tractors and none have ever had an engine failure. Coincidence? Maybe, but I like the odds.
While Rotella T "synthetic" isn't bad, (especially at the walmart special price of 12.88 a gallon instead of the "normal" price of 18.88) it is a group III motor oil. Even though it says "synthetic" it is actually a conventional base stock that has been "cracked" to give it "synthetic" qualities.
Same goes for Castrol syntec. It is a group III oil. I hate how the marketing strategy is really a lie to the consumer.
Anyway, I've probably studied motor oils too much for my own good, but that is what the general concensus is based upon oil analysis and experience. /forums/images/graemlins/cool.gif I'm mainly curious about the transmission oil change experience in the RTV. I'll certainly use Kubota filters. I suppose I'll also use Kubota UDT as well since it is still under warranty. However, I was wondering if using a synthetic oil may help the sticking in gear problem Kubota RTV's have.
I had a Kubota corporate guy and then my dealer call me back yesterday on my transmission. They both told me that I have to "pop" it out of gear. Technique they said. Okay...but I've never had to slap the gear selector in anything else I own to get it out of gear. Maybe a more slippery synthetic would help? /forums/images/graemlins/confused.gif I only have 25 hours on my RTV and the recommended change isn't due for another 25 hours. However, it is getting a bit harder to get out of gear all the time now. Change the transmission oil and filters now?
