re: What oil & oil filter do you use?

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All conventional oils, no synthetics.

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For a crankcase, you usually aren't gaining much from synthetics. While the oil itself holds up longer, it will still load up with blow-by crap long before you reach the usable life of the oil itself.

With gearboxes, steering pumps, etc synthetics are usually worth using, since blow-by isn't an issue and thermal loading is.

My trucks get conventional 5w30 and mobil filters usually, fourhweeler gets conventional 10w30. Sometimes I put other stuff in the 4x4 if it's on sale.