Castrol Choice
Hey,
Allow me to answer your question with a short story of an experience I wish I didn't have. At one time I owned a 1 ton Chevy 4x4 with a small block 350 turned into a 385 stroker using all stock components (other than carb and chrome molly rings). My so called uncle (by marriage) was jealous of my truck because it ran better than his. He waited for me to do an oil change ( I used Castrol syntec 20W50), and he went out and drained my oil from my truck and put the oil into his own truck leaving mine dry. Because I had JUST changed the oil I did not think to check the oil again due to checking it several times only a short time ago. So, thinking the oil pump tick was the pump going bad, I went and priced a new pump. After 2 days of driving my truck because I had no choice ( and this was in 100+ degree weather mid-summer and using a 2 core radiator), the truck blew. When I tore the engine apart, the cam was in 3 pieces, a lifter rod was hanging out my oil pan, 2 connecting rods were bent, and the number 8 piston was black, chunked, and siezed to the block.
If you ask me, Castrol is a good choice. 2 days in over 100 degree weather with a 2 core radiator on just a thin film of oil and no oil pressure..... Because of that incident, I trust only Castrol. The only other oil I would recommend is Royal Purple.