SAE 30 Oil for 7800: Kubota Review  -- Kubota Tractors Discussion Forum and Review SAE 30 Oil for 7800: Kubota Review -- Kubota Tractors Discussion Forum

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 06-29-2005, 20:44 Post: 112919
beagle

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 SAE 30 Oil for 7800

I checked the archives but didn't see SAE straight 30 oil discussed. My dealer insisted that this was the best oil to use during the summer in my 7800. Didn't seem right to me, but the manual did list SAE 30 above 25 degrees. I put it in at the last oil change, and either it's my imagination, or I hear something that sounds like valve noise. If anybody has any comments, they would be appreciated. I am thinking about taking it out of the tractor and putting in either 5W or 10W40. I'll be changing this oil before winter either way.

Any suggestions. It sure sounds like valve noise to me.






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 06-29-2005, 23:52 Post: 112926
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 SAE 30 Oil for 7800

Take it out and go with the multi-weight. I don't even understand why single weight oils are even still made.

If you are satisfied that your engine is broke-in, I think you would see an increase in performance with a dose of Mobil 1 or similar diesel rated synthetic multi-weights.






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 06-30-2005, 06:20 Post: 112930
beagle

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 SAE 30 Oil for 7800

Thanks, I'm draining today. Thinking of going with 10w40, synthetic blend. The machine has 133 hours on it. It's broken in.






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 06-30-2005, 08:46 Post: 112934
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 SAE 30 Oil for 7800

I've been led to believe that 300 hours is considered minimum before switching to synthetics.

I use 15W40 myself. But when you select oil for diesels - single viscosity or multiple - it MUST be labeled as API type C(x) where x is generally F or higher. You may have put in a 30W that was intended for a gasoline engine, labeled as API type S(x) where x can be as low as A. That's stuff's barely usable for lawnmowers.


//greg//






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 06-30-2005, 10:03 Post: 112936
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 SAE 30 Oil for 7800

SAE 30 may be an acceptable substitute oil if nothing else is available but as already stated; use a good quality 15W-40 diesel rated motor oil. Shell Rotella T 15W-40 comes to mind as a long time and honored favorite. It is stocked at every Wally World store I have been to. All the 10W-40 oils I have seen are NOT diesel rated. They do not have the soot control additives and other requirements met by a diesel rated oil.






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 06-30-2005, 10:25 Post: 112938
beagle

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 SAE 30 Oil for 7800

It was Kubota SAE 30 oil. Purchased from the dealer. It's coming out for 15w40 this afternoon. I put about six hours on the machine with this stuff, not at all happy. Kept the dealer reciept.

Thanks for the input.






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 06-30-2005, 10:35 Post: 112940
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 SAE 30 Oil for 7800

I'd check your manual again, my B7610 says 10 W 30 or 10 W 40, I do not see 15 W 40 as an option, I'd go with the 10 W 30, particularly if you are thinking the single weight 30 was too thick. I am using Mobil One 10 W 30.






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 06-30-2005, 10:49 Post: 112941
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 SAE 30 Oil for 7800

Thanks for the heads up. You are so right, 10w30 or 10w40. The dealer sold me 15w40 last fall. Not in the manual though. After the fiasco with my clutch, I'm sticking to the manual "to the letter".






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 06-30-2005, 10:52 Post: 112942
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 SAE 30 Oil for 7800

5w-40w shell rotella t synthetic is all I use in any thing.






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 06-30-2005, 11:03 Post: 112944
Chief



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 SAE 30 Oil for 7800

I used the Shell 5W-40 Rotella T synthetic this winter in my Cummins diesel for the first time this year and am very impressed with it. Worked VERY well for cold weather starts. After 7 months of use it still looked to be in good condition when I changed it out. I use John Deere 15W-40 Plus 50 for summer use.

Your manual may indeed call for 10W-30 or 40 but be SURE you read the label of the oil can. Not all if many of these oils are diesel "C" API rated. I also am a firm believer in using what the manual calls for.






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Discussion Boards > Active Subjects > Messages as Posted > Kubota Review Forum

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Art White 2 | beagle 4 | Chief 2 | DennisCTB 2 | DK35vince 1 | DRankin 2 | greg_g 1 | hardwood 3 | jarndt 1 | JAZAK5 1 | Murf 1 | shinefeak 1 |




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