There is article in this month Super Chevy Mag. on oils. All of us know about oil for out 348/409 engines, but oil for our modern direct injection Chevy engines. I have been using the correct Amsoil for my 2017 truck, but did not know if you did not use the oil with the SN Plus sign (Desos1 Gen2) it could be devastating to your engine. Good article on different oils. Please read.
W Head
59 Impala 409-2,4s
W Head
59 Impala 409-2,4s