Cobra Owners Preferred Engine Oil Brand?

[BAsque1]

What is wrong with using Castrol 10 W 40 non synthetic if you are not racing your engine? I have had outstanding results with Castrol all my life. Perhaps I am not convinced yet that synthetic oils are all that great. I have a 427 FE side oiler.
Basque1

[zrayr]

Originally Posted by BAsque1

What is wrong with using Castrol 10 W 40 non synthetic if you are not racing your engine? I have had outstanding results with Castrol all my life. Perhaps I am not convinced yet that synthetic oils are all that great. I have a 427 FE side oiler.
Basque1

I think you have to take each oil on a case-by-case basis and research what the current formula is. Some new formulations have little resemblance to what the oil used to be. So a given oils history of being adequate in the past isn't a good indication of how it will perform today.

Many manufacturers have published the zinc/phosphorus specifications for their current line-up of products. I would be suspect of a manufacturer that was not forthcoming with new data on their products.

Z.