Originally posted by Guntaker:
yeah, Castrol Syntec 5w30. Other owners also like to use Mobil 1 syntec too!


Syntec is NOT a True synthetic!
It also promotes high ash content (acidic build up)

Popular Science/Mechanics (one of them) did a great write up on it a few years back just blasting the holy hell out of it and it's "synthetic" claims.

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If one wants to run synthetic I would recommend Mobil 1 or AMSOil.
Followed closely by Pennzoil. Then Valvoline.

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Now if you want to run Dino most of the "major" brands are good.

I do agree that Motorcraft is made out of one of the better dino base stocks.

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I run Mobil 1 0W40 because 5W40 is not readily available locally.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.