Question on head gasket and oil additive

[Myron Piatek]

Originally Posted by big blue galaxie

The motor oil is now named Amsoil Signature Series 0W30. The also have a 0W20.

Those are not the same oils. The Dominator Series is new as of last year and are fortiufied more for the racing environment. The Signature Series 0W-30 may have gotten reformulated a year or two ago. I'm only speculating, but it may have to do with newer model emission regulations and compatibility, similar to a new diesel formulation for 2007 & newer diesel trucks. I believe the zinc content has something to do with it. The race oils, older diesel, including the HDD 5w-30, and some of the others, still have a large amount of zinc and similar additives. It's all good stuff nonetheless.

[james schaechter]

I would have to agree with Alan on the head gaskets. I have used Cometics on our 283 and 327s and reuse them 3 times, then I take them off and save them. I probably could use them again. They get pretty reasonable when you get to use them more than once. You tell them the bore size and thickness and they take care of it.

[big blue galaxie]

Originally Posted by Myron Piatek

Those are not the same oils. The Dominator Series is new as of last year and are fortiufied more for the racing environment. The Signature Series 0W-30 may have gotten reformulated a year or two ago. I'm only speculating, but it may have to do with newer model emission regulations and compatibility, similar to a new diesel formulation for 2007 & newer diesel trucks. I believe the zinc content has something to do with it. The race oils, older diesel, including the HDD 5w-30, and some of the others, still have a large amount of zinc and similar additives. It's all good stuff nonetheless.

The product I was referring to was either the Series 2000 (or might be 3000) and they are a different product line from the Dominator series; it looks like they renamed it but I have to check with tech to verify it. And you know that the chemistry will work either way.