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Mineral Oil & Synthetic Help
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StewartR1980
First Gear User
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April 11, 2019 - 6:37 pm
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Hi all, 

I have recently taken ownership of a D14/4 Supreme, my first classic!

I am in the process of a little fettling to get it worthy, and I am wondering about Oil, as in planning on changing the gearbox oil and flushing the old petrol.

Appreciate there are many schools of thought but;

 I have some Halfords 20/50 classic mineral oil, which I use in my old mini. Would this be ok to use in conjunction with a synthetic Maxima 927 oil in the tank? I’m after the Castrol whiff without the issues!

Also the owners manual recommends using a flushing oil, does anyone do this or would I just end up with a leaky gasket?!

Many Thanks

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mikef
Chatham Kent
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April 11, 2019 - 9:02 pm
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Hi Stewart.
        20/50 oil in the gearbox will be fine, many people use it. The correct oil is 40 SAE but 20/50 is close enough. I used 10/40 in my D14 for a while before I bought some 40 SAE and that seemed OK.
Flushing the gearbox would probably be OK but I have never done it, so can't really say for sure. I don't see why it would do any harm.
Maxima 927 is suitable for pre-mix according to the literature, so I think that would be OK for a Bantam. Quite expensive though.
I have used mineral, semi synthetic and fully synthetic in my D14 over the years. I now only use Halfords fully synthetic as I find that it smokes a bit less.
I use a ratio of 25:1 petroil which is pretty close to the 24:1 stated in the manual. I have had no problems.
Hope you're on the road soon.
               Mike.

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swalsh58
St. Mary's Bay, Kent
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April 11, 2019 - 10:18 pm
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I wouldn’t bother with flushing oil. Any decent 20/50 or SAE 40 will do, I don’t think it’s critical. There is loads of posts on here about which 2 stroke oil to use, and at what ratio.

Current bikes......1958 D5, a 77 Suzuki GT250 and a 77 Honda CB125S. I have a B175 in the workshop and a 76 Honda C90 waiting its turn. A 1980 Honda CB400N waiting for MOT.  Everyday ride is a 2011 Harley Davidson Sportster. 

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cocorico
Central France
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April 12, 2019 - 7:50 am
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swalsh58 said
... There is loads of posts on here about which 2 stroke oil to use, and at what ratio.  

Try typing oils site:bsabantamclub.com/forum into your browser query box to see what's already available on the forum. If you save that query and change 'oils' for different keywords for whatever you need to know, most questions have already been answered. If you can't find anything, ask away.

Bear in mind that the oils in use when your bike was new were not as advanced as current ones, so modern oils should pose no problems.

1956 D3 running, lights to sort. 7 other bikes in the Barn, including a Morini 250 now insured and on road testing.

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nickjaxe
Runcorn Cheshire UK
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April 12, 2019 - 8:30 pm
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I was told...i have no idea myself...that 20/50 has additives that do the clutch no good...for the price of SAE40 I thought it not worth risking it.

My Bantam video              https://www.you.....jpOFmzRZRI

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Peterg
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April 12, 2019 - 10:46 pm
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nickjaxe said
I was told...i have no idea myself...that 20/50 has additives that do the clutch no good...for the price of SAE40 I thought it not worth risking it.  

If you used it in your Mini there should be no problems as both used wet clutches. What ever you use check that it is suitable for wet clutches. Not all gear oils are. There is no need to flush the oil. Straight and gear oils do not emulsify in the way that engine and ATF oils do in low temperatures.

As far as petrol goes any two stroke oil in the right ratio will do. Bantams are not as fussy as their owners! In times of poverty I used 20/50 without problems. Even the cheapest 2 stroke oils are better than what Bantams were designed to use.

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AdrianS
Harlaston Staffs
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April 13, 2019 - 10:20 am
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I didn't think the old Mini had a wet clutch?

I seem to remember mine was dry when I changed one in the 70's

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Peterg
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April 13, 2019 - 11:14 pm
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You are right, I meant to say integral engine and gear box oil

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