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You can only use the engine oil supplied by the Ford Dealer. For some strange reasion any other oil even oil that is more expensive will not stay in the engine between services. Ford developed it for all their engines.

OP,

I've used Havoline in every Ford I've ever owned, so has my father. He's been driving and working on Fords since the 1950s. I've never had a problem with them losing more than 1/4 of a quart in 5000 miles and that was in a 15 yr old 4 cyl mustang that I drove as if it was a 5.0 till Dad took it away from me.

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13y ago
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Q: What oil do you use in your 2003 Ford Focus?
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