Author Topic: What grade of oil  (Read 426 times)

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Offline Jeff Swann

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What grade of oil
« on: 08 Sep 2018 at 16:52 »
Just took delivery of my 1912 model H 2 3/4hp Douglas read through all the paperwork, owners manual, etc., but no mention of what grade of oil I should use, I have 30's & 40's Classic oil ??

Also could I use multi grade in my dragonfly??

Offline eddie

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Re: What grade of oil
« Reply #1 on: 08 Sep 2018 at 18:25 »
Jeff,
        I run my 1913 2¾hp on straight 40 grade oil with no problems, and the Dragonfly on 20/50 multigrade - again with no problems. Having said that - I would not put a modern multigrade oil in a Dragonfly engine that had run on monograde without a crank strip down to remove any accumulated sludge. It's amazing how much sludge gets trapped in the crankpins - and the detergents in multigrade can easily get it on the move - with the possibility of blocking the crankpin oil holes.

  Regards,
                 Eddie.

Offline Jeff Swann

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Re: What grade of oil
« Reply #2 on: 08 Sep 2018 at 20:18 »
Cheers once again Eddie for your prompt reply, hopefully meet you one day soon. Jeff

Offline BrmBrm

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Re: What grade of oil
« Reply #3 on: 21 Oct 2018 at 09:54 »
Engine oil for Dragonfly.
I note Eddie's warning re. multigrade, detergent, and blockage of oilways.
I'm going to use a 20w/50 as an oil for very light use,  to evaluate the rest of the bike before a full engine strip down. I'm assuming that the clutch is a dry clutch, if so I could presumably use a car oil rather than a motorcycle oil.