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Regular vs. Synthetic oil

I OWN a 2003 Ford Falcon BA XR6 ute, which I bought new. At the first service, and again at the next service, I was asked if I would like to put Mobil 10W-40 full synthetic oil in the engine, or just use regular oil. I asked for the Mobil oil. Do you think I should change the oil and filter every six months, instead of waiting for the 12-month service, due to it being a fully synthetic oil?

FORD'S recommended oil is Mobil Super GF 10W/30 for the XR6 and Mobil Super XHP 15W/40 for the XR6 Turbo, both mineral oils. I would stick with Ford's tip.

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