posted July 31, 2006 11:11 AM
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If this oil has gone 2 years I dought it will go 2 more BUT there are to many varibles to consider and oil will NOT degrade in a straight line.
It may have gone from a 500 hout RBOT in say 2 years to 192 now BUT that does not mean it will last another 2 years since it will get increasingly get worse.
Trending the oil for TAN increase (from new oil) is the best answer hopefully you have some previous data to look back on if not start doing trending NOW.
Check with your lube supplier good turbine oil will run >500 hours new as far as a change out get the suppliers recomendation a TAN >1.0 is a Max limit IMHO aswell as wear debris leveals.
Also might ask your oil lab about a recomendation Anaylysts Inc may have one.
bruce