My dad is a firm believer of anything he has known since his younger days, including oil knowledge. Winter will be here soon, and trying to get him to try a 5w/30 is impossible. He managed a snow plow industry, and is regularly called out when the temperatures are lowest just after midnight. His belief in 10w/30 oil seems to him is the god of oil, specifically Castrol. Castrol, castrol castrol. Everything castrol. Gtx specifically, synthetic to him is lighter than water and is too thin to hold up to hot temperatures, and too thin to lubricate properly for winter starts. He thinks it's formula has been the same since the 60s, and sm/SN are just printed to get attention. Why does he like 10/30? Apparently to him, 10 weight is thicker, yet the oil pump throws the oil farther around the engine when frozen, lubricating it better!!!
Can we teach this old dog new tricks?
Can we teach this old dog new tricks?