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JD Yanmar deisel engine #5397713 04/08/20 07:14 PM
Joined: Dec 2002
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yankees1 Offline OP
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I just bought a 2018 JD with a Yanmar diesel 25 hp engine. What weight oil would be best for summer usage ?

Re: JD Yanmar deisel engine [Re: yankees1] #5397719 04/08/20 07:18 PM
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Slick17601 Offline
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Whatever the manual says.


2018 RAM Bighorn 5.7
2008 Toyota Sienna 3.5
Re: JD Yanmar deisel engine [Re: yankees1] #5397728 04/08/20 07:22 PM
Joined: Oct 2014
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CT8 Offline
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Owners manual will tell or call the john Deere dealer .


2015 F150 2.7
2018 F350 6.2
Re: JD Yanmar deisel engine [Re: yankees1] #5397737 04/08/20 07:27 PM
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atikovi Offline
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6 pounds.

Re: JD Yanmar deisel engine [Re: yankees1] #5397741 04/08/20 07:31 PM
Joined: Apr 2009
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walterjay Offline
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You should use a diesel 5-40 oil for year round use. No need to change it out for winter. Rotella T-4 would be a good choice.

Last edited by walterjay; 04/08/20 07:34 PM.
Re: JD Yanmar deisel engine [Re: yankees1] #5397756 04/08/20 07:53 PM
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Dinoburner Offline
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Using Rotella T6 in my Kubota year round. On second OCI with no problems for what little thats worth.


77 Chev stepside 454 Casteroil syn
95 GMC 4wd mobil syn
2016 Equinox LTZ V6 dealer
Kubota L5030 T6
Re: JD Yanmar deisel engine [Re: yankees1] #5397763 04/08/20 08:03 PM
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walterjay Offline
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My mistake....I meant T-6

Re: JD Yanmar deisel engine [Re: yankees1] #5397809 04/08/20 08:42 PM
Joined: Dec 2002
Posts: 238
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yankees1 Offline OP
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With 100 hours on tractor would you recommend conventional oil or synthetic ?

Re: JD Yanmar deisel engine [Re: yankees1] #5397819 04/08/20 08:53 PM
Joined: Dec 2005
Posts: 14,218
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kschachn Offline
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Again, what specification or license does your owner's manual give for the engine oil?


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: JD Yanmar deisel engine [Re: yankees1] #5397822 04/08/20 08:56 PM
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Posts: 2,934
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dave123 Offline
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Been running 5w40 with yearly changes for years on my little 25 hp JD diesel.

More importantly I run Power Service Bio Kleen in fuel every time. .25oz per 5gallons

Last edited by dave123; 04/08/20 09:00 PM.
Re: JD Yanmar deisel engine [Re: yankees1] #5397838 04/08/20 09:25 PM
Joined: Oct 2014
Posts: 15,248
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CT8 Offline
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Good buy on the Deere I owned a 4310 for 13 years and sold it when I moved . The owner of the house I bought left a DK45 Kioti ,it is a surprisingly a nice tractor. I will tell you why a John Deere is by far the best tractor you can buy,,It is the parts availability . The parts are what over shadows the J.D quality . The parts availability is far superior to any other brand as well, That is why the big farmers and Dairymen people have John Deeres


2015 F150 2.7
2018 F350 6.2
Re: JD Yanmar deisel engine [Re: yankees1] #5397840 04/08/20 09:27 PM
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doitmyself Offline
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I maintain a 2005 JD 4115 25hp Yanmar powered tractor at my workplace with about 1200 hours on it. The recommended OCI is 200 hours using 5w30 crzy, 10w30, or 15w40. JD's oil grade recommendations never made sense to me. I change it once a year at about 90 hours because it has a really small sump - only 2.1 quarts vs. my old Kubota with 4+ quart sump.

When new, I debated 10w30 vs. 15w40, maybe running the 10w in winter and the 15w in the summer (very short OCI). The dealer, for what it's worth, recommended running the 15w40 year round,especially emphasizing it for summer. That's what I've been doing and everything is fine. The tractor sits in an attached unheated garage (tempers the cold a bit) during winter when I use it for snow plowing. It starts just fine in the winter, but I'm sure that it is not the best option the very few times it is started below 10F. My old Kubota recommended 10w30 year round.

If I used this tractor a lot of hours, I would consider managing the oil better. My point is, at my low hours accumulation, I will never notice that extra bit of engine wear that occurs on 3 or 4 cold start ups per year. One would think that 5w40 would be the best for a year round oil if you are on the fence about choosing. I know Dnewton is impressed with HDEO 10w30s and maybe that would work as well - the dealer thought it might not be wise under very heavy, hot summer use. shrug

I'm in central lower Michigan.

Re: JD Yanmar deisel engine [Re: yankees1] #5398007 04/09/20 05:27 AM
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yankees1 Offline OP
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Thanks for all your replies !

Re: JD Yanmar deisel engine [Re: yankees1] #5398017 04/09/20 06:20 AM
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riff1006 Offline
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I used 15w40 year round in my 28HP Yanmar JD without issue. What a great motor!


2017 Mazda 6 Touring
2008 Ford Fusion-2.3L
Re: JD Yanmar deisel engine [Re: yankees1] #5398131 04/09/20 08:48 AM
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gman2304 Offline
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I used Rotella T4 15w40 conventional in my 1992 JD 332 Yanmar diesel for over 20 years. It ran like a top when I sold it 7 years ago.

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