Hello, I am running an Aluminium Spur gearbox with 75W90 Synthetic oil around 200F temp in lab endurance test continuously.After 400 hrs the lubrication is failing.The oil is completely blackened out. The oil condition test shows that Phosphorus and Boron particles are burned out. There was significant sulfur content increased in the oil over the test duration. The housing innner surfaces are permanently blackened . Please let me know the reason for the increase in Sulfur content and housing blackening.Whether 75W90 Synthetic is not correct choice for this application. Thank You.
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