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Thread: MotoMaster 15W40 Diesel Oil

  1. #11
    Join Date
    Aug 2005
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    Wyoming County, New York
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    Quote Originally Posted by mmattockx View Post
    I've never used it, but I expect it is perfectly fine to run in your 850 if that is your goal. Diesel oils have extra anti-wear additives and no friction modifiers so they generally work well in bikes. I run Rotella T6 5W40 in all my bikes with no issues.


    Mark
    Did you mean T6 15w40? I just want to make sure I'm not missing something or if that was just a typo. I usually get the full synthetic T6 15w40 when I have the extra couple bucks.
    1986 yamaha fazer 700 - for sale
    2002 bmw r1150gs 1978 gs1000E skunk les pew 1979 gs1000L dragbike
    https://m.youtube.com/watch?fbclid=I...ature=youtu.be
    82 gs1100L probably the next project
    1980 gs1000G the ugly 1978 gs750E need any parts?
    1978 gs1000E skunk #2 RLAP

  2. #12
    Join Date
    Feb 2018
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    Davis,CA.95616
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    I purchase the standard Rotella T4 15/40 from a local big box store,less than $15 a gallon.I learned a few years back,from someone on another forum the additives for our wet clutches and gears,etc. is listed on the back: JASO MA/MA2 under "performance requirements" from different diesel engine manufacturers,according to this other forum.I've been running it since 2012' and good so far.

  3. #13
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    Sep 2012
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    Ireland
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    Quote Originally Posted by Brendan W View Post
    I go down the local engineer/hydraulic/bearing/farm contractor shop and get the 15/40.
    Yep, I have 20L of Gulf Supreme Superfleet 15w40 that will do for a few years, and have been grabbing some deals here and there as they come up.
    The Gulf on its own will do fine - it's a brand name trustworthy oil that thousands of trucks and tractors are running on - but I prefer a lower winter rating, which is why the current occupant of the sump is a 5w50 racing oil with some extra anti-wear additives already in it, although it remains to be seen what its shear stability is like in the long term. I normally change the oil as soon as the gearchange gets clunky, which is about 2000 miles, almost without exception.
    I may blend the Superfleet with a 5w40 synth.
    Last edited by Grimly; 11-14-2020 at 12:04 PM.
    ---- Dave
    79 GS850N - Might be a trike soon.
    80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
    79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
    92 XJ900F - Fairly Stock, for now.

    Only a dog knows why a motorcyclist sticks his head out of a car window

  4. #14
    Join Date
    Oct 2011
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    Victoria bc
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    I have used the Rotella diesel for years in my classic bikes....then last year I was riding my Cooley to California...a buddy sells Amsoil and I decided to treat my bike to full synthetic.... what a mistake....1500kms (1000 miles) into the trip I had to put a litre of oil in my bike...and my bike never used oil like that before....
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  5. #15
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    Jun 2017
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    Sandy, Utah
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    Quote Originally Posted by trevor View Post
    I have used the Rotella diesel for years in my classic bikes....then last year I was riding my Cooley to California...a buddy sells Amsoil and I decided to treat my bike to full synthetic.... what a mistake....1500kms (1000 miles) into the trip I had to put a litre of oil in my bike...and my bike never used oil like that before....
    Did it leak too? My GS1000 developed a bunch of leaks when using synthetic. No issues running conventional dino juice though.

  6. #16
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    Oct 2011
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    Victoria bc
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    Quote Originally Posted by 80GS1000 View Post
    Did it leak too? My GS1000 developed a bunch of leaks when using synthetic. No issues running conventional dino juice though.
    No it never leaked....but weird eh? I think the old girl is more of a Budweiser girl than a Heineken girl...lol
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  7. #17
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    Sep 2010
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    Chicago, IL
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    Have you ever taken the Cooley on a long trip like that on Rotella? 1000 miles of mostly highway vs mixed driving could be a factor.
    -1980 GS1100 LT
    -1975 Honda cb750K
    -1972 Honda cl175
    - Currently presiding over a 1970 T500

  8. #18
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    Dec 2013
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    Quote Originally Posted by Brendan W View Post
    Bet you weren't wearing your farmer's hat
    Like this?

    image.jpg

    I found this in the closet of a greasy spoon I worked in in 1979. It was in exactly this condition. Just now, I panicked when it wasn't where I first looked. It's weird, but I treasure it.
    1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

    2016 XL883L Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

  9. #19
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    Oct 2011
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    Quote Originally Posted by Tom R View Post
    Have you ever taken the Cooley on a long trip like that on Rotella? 1000 miles of mostly highway vs mixed driving could be a factor.
    Many times....I have put almost 20,000 miles on it in 4 years. I have rode it to California on Rotella and no issues.
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  10. #20
    Join Date
    Jun 2018
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    Mifflinburg, PA / Land of Tar & Chip
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    Question for the hive on switching to Diesel oil.

    I realized yesterday, that Sam's club sells Rotella 15W-40 in bulk. I'm there at least once a month anyway. If I want to switch from using 10W-40 Motorcycle JASO MA2 oil to Rotella, besides a new filter, and draining as much of the old oil as possible, is there anything else special I need to to before putting in the Rotella?

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