Ductape wrote:
We do used oil analysis to determine when to change oil in some infrequently used industrial engines. Often go several years on the same oil. UOA is the only way to be sure, however at the stated mileage I personally would not change it or bother to spend money on the sampling.
The only problem with an oil analysis, on engines that are not used very often, is that it does not take in to account any moisture that is in the engine cavities that can be eroding away at the intake/exhaust valves, intake manifold, or any other area that may be affected by outside humidity.