considering that old engines need Zddp additive oils, can some one tell me the thinnest possible oil available in api sg or api sj grade?
i would like to try fully synthetic, but they are all api SN, good for the newer cars.
i am currently using Caltex Delo Gold, 15w40, in my 1996 civic d15 sohc engine. changing at about 4000km, car is driven 215,000km. milage i get is between 10-12.5 km/liter