Hey guys, this site was recommended to me.  I recently purchased a 1961 Ford F100 Uni with a 292.  I haven't gotten under it yet but I think it still has the original "canister" type oil filter.  I'd like to do a good oil change on this and if its not already on possibly add the spin filter adapter.  My question is what type of oil is recommended?  I've been to use a detergent oil but honestly do not know what that is, or just use conventional with a detergent additive.  I don't think the oil has been changed on this truck for some time.  Any advice would be great....Duke.