Longevity depends a lot on maintenance and the operator. The addition of spin-on filters helps oil pressure develop more quickly at start-up. This same engine is used in the White 2-135 and 2-150 farm tractors. I know of several with near to 10,000 hours on them and still running very strong. 8,000 hours is not unusual. Farm and field work is harder service than in a truck because the engine spends more time at higher load percentages. We expect that, with good maintenance practice, to have service out of them in our trucks similar to what is gotten by our neighbors with the White tractors. So far, this has proven to be true.
We have bought three of the spin-on filter bases from farm equipment salvage yards for $65.00 each, which is a lot cheaper than the cost of the conversion kits advertised here. You do, however have more time involved in changing the whole filter base on your engine as opposed to just screwing on the adapters. We like investing time rather than spending money when some effort will save cost, so it was a good option for us to buy the bases. I recognize not everyone will want to do it that way!
Regards Marti