Hi All,
Asking the question?
What brand and grade of oil is BB using?
There are some brands of "classic" oils on the market that are not suitable for our BSA bikes
As far as I can find out they are 're constituted blends? So have "heavy" additives which can form a thick slimey coating that clogs up gauze screens etc.
Swarfcut ? Asked about using modern multi grade oils in our BSA's,
As far as I know these do not have the zinc additive needed for cam/tappet lubrication as in BSA engines.
Attached pic of a sludged up tank filter that resulted in a main bush seizure
![eek *eek*](https://www.a7a10.net/forum/Smileys/default/icon_eek.gif)
I only use Castrol 40 in the BSA's and their 20/50 in the MG
John