Hi,
Camprunner - 20 & 30 monogrades were popular in the 1950s >
10W-30 came on the scene in the late 1950s and became very popular with US engine makers. I've mentioned many times before - 20W-50 was a special lubricant formulated for the BMC Mini of 1959. First it was Duckhams' Q20W-50 followed later by Castrol's 20W-50. In the early Minis the shared engine/gearbox arrangement caused rapid permanent shearing! The A & B Series BMC engines were very happy on SAE20 or 10W-30
Camprunner - 20 & 30 monogrades were popular in the 1950s >
10W-30 came on the scene in the late 1950s and became very popular with US engine makers. I've mentioned many times before - 20W-50 was a special lubricant formulated for the BMC Mini of 1959. First it was Duckhams' Q20W-50 followed later by Castrol's 20W-50. In the early Minis the shared engine/gearbox arrangement caused rapid permanent shearing! The A & B Series BMC engines were very happy on SAE20 or 10W-30