A TEST ON THREE MOTOR LUBRICATING-OIL ADDITIVES——701, 711 AND 711A

Three different additives (701, 711, 711A) of barium salt of alkyl-phenol type for motor lubricating oil have been synthesized, and their effects on the performance of motor lubricants produced from the Soviet crude oil of Second Baku and Yumen crude oil have been investigated. Their viscosity-index improving, oiliness, anti-corrosion, anti-oxidation and detergent properties have been evaluated. The motor lubricants with above three additives added have also been tested on a single cylinder engine. For comparison, a Soviet. diesel lubricant of -14 has been selected and a Soviet additive -1 has been used for parallel runs. Tests show that additive 701 improves the viscosity-index, slightly, but additives 711 and-711A produce a somewhat unfavorable effect. Additive 711A shows the best result on improving oiliness. It also improves the anti-corrosion property significantly of the motor lubricant of Yumen origin. All three additives 701, 711 and 711A show good anti-oxidation property below 250℃, but deteriorate rapidly at higher temperatures, such that this additive effect becomes almost nil at 300℃. For detergent effect, additive 711A improves Second Baku crude oil motor lubricant from grade 6 to 1 on model engine test. Preliminary engine tests of motor lubricant containing additive 711A on a gasoline type single cylinder engine show that less acid is formed, viscosity is lowered, less deposit is found on pistons and rings, and less corrosion is observed.