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CORRECT GRADE OF OIL

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Riding B44R:
I recently acquired my 1967 B44R and hope to be out and about on it when the weather's fine.  Looking in the manuals, BSA scheduled Castrol XL for engine oil and Castrol 90EP for the gear box.  Obviously these particular grades are not available these days.  Can someone advise me of the recommended Castrol 2017 equivalents please, as I would like to stick with Castrol if possible. On the Castrol web-site they list the B25 and the B50 but not the B44R.

STAR TWIN:
Castrol XL is still available. I have 20 litres in my shed. Have a look at Morris lubricants website. They have oils for every possible use. My rule of thumb is straight 40 for roller big ends, 20-50 for plain big ends. Many people use multigrade for everything with no problems. It's a big subject with many strong opinions. Essentially, if you use a reputable oil and change it regularly you won't have any problems.

Bess:
Hi,
    If you prefer Castrol this maybe worth a look

https://www.castrol.com/en_gb/united-kingdom/products/cars/classic-oils.html

Best wishes...

ANDY HIGHAM:

--- Quote from: STAR TWIN on 27 October, 2017, 19:02:57 ---Castrol XL is still available. I have 20 litres in my shed. Have a look at Morris lubricants website. They have oils for every possible use. My rule of thumb is straight 40 for roller big ends, 20-50 for plain big ends. Many people use multigrade for everything with no problems. It's a big subject with many strong opinions. Essentially, if you use a reputable oil and change it regularly you won't have any problems.

--- End quote ---
Why? Straight 40 has no advantages over 20/50. In really cold weather it may not even flow through the oilways properly.
"R" type oil does have an advantage in roller bearing engines as the molecule chains are more resistance to the shear stresses imposed on the oil by rolling bearings.
I am a firm believer in the abilities of scientists and technicians to develop better oils than the oils of 50 years ago. I use fully synthetic 20/50 in my B31

griffo:
What ever clapper rings you're bell.. For me the fully synthetic oil can leave the engine like a Welshmans garden... Full of leaks... Simular thing with the semi-synthetic.  The rule of thumb I use is pre-65, 40 grade and 20/50 for younger motors. Change it regularly, specially at this time of the year so the motor has nice clean oil in for the Winter. Depends on the mileage, usually 1.5k Another change before going to the Manx. Trials/long distance reliability Cub gets oil change every 1k miles  and I have never wrecked an engine due to oil failure... Just make sure it is good oil and not this premium grade, costs a fortune and contains more additives than an old motor needs and is expensive. Castrol, Morris's, Elf and various grades are not too costly and do a great job...  Griff

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