1939bcoupe Posted April 15, 2019 Share Posted April 15, 2019 What is the latest info on SM and SN oils? What oil is best for my 39 Buick? Heard so many stories. Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted April 15, 2019 Share Posted April 15, 2019 I will be SURPRISED if there is a consensus. Any oil today is superior to the oil of the '30s and '40s. I use Rotella 15-40 in my '50. Ben Link to comment Share on other sites More sharing options...
39BuickEight Posted April 15, 2019 Share Posted April 15, 2019 Rotella seems to be the most popular as it contains zinc, which I hear is a good thing. It use it too. Link to comment Share on other sites More sharing options...
Bloo Posted April 15, 2019 Share Posted April 15, 2019 I use Rotella 10w30 in my older rigs, and Valvoline VR-1 20w50 when I need something thick (you probably don't need something thick in that Buick). Rotella is just good basic fleet oil, OK for both gas and diesel engines. It allegedly still has some zinc in it. There are better things available. I'm sure you will get 100 different answers before the thread is over. Link to comment Share on other sites More sharing options...
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