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I'm not sure that it makes much difference. The problem is letting a truck sit long term with used oil, but you drive it once a week. It this case I would follow a timed oil change and not a mile-based one. IOW, something like an oil change every 3 months rather than 3000 miles. Make sure when you do drive the truck, to get it warm and avoid too many quick trips. A good long drive with the truck at operating temperature should help to evaporate moisture that will have accumulated in the oil. This will have the added benefit of making sure you get a good charge on the battery and get lube slung all around in the tranny and axles (moisture there is also important to get rid of). Otherwise, I wouldn't worry too much about it. There are different opinions on what to use, crude or synthetic. I've heard that synthetic can break down and seperate when left sitting, but it sits on the shelf sometimes for a while and it seems OK. So I think that's an urban legend. Crude based oil is supposed to be bad on seals when left sitting, but that also sound bogus to me. I'd think the only advantage synthetic really has in your case is that it might flow faster on start-up. Since in a week the oil will have all drained, that might be something worthwhile. Personally, I'd do a 3 month oil change with Castrol GTX and not worry.
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'91 XtraCab Pickup
'92 WilderNest Adventure Camper
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