Postby Paul_Linden » Mon Mar 30, 2020 7:24 pm
The detergents in a modern oil will release all the old carbon that is stuck on the internal walls of an old engine in to the oil. As there is no oil filter in a square four these bits of carbon accumulate in the sludge trap very rapidly blocking the feed to the big end. Resulting in a rapid, unplanned, deconstruction of the engine.
Square 4 mk1, Square 4 mk2, Ariel Colt, Matchless G12, BSA C12.