[Chester Stone]

The previous owner used Delo Synthetic 5W40, so I continue to use it in both the engine and the generator. In 8,000 miles, I used a quart, so I am pleased with the Synthetic. Walmart sells it for $20 per gallon and it the cheapest I have found anywhere. For the Detroit two cycle engines, Delo 100 40W is specifically designed for those engines. No way would I put 40W in my Detroit 60. I have read that the filters for the 60 Series should not be prefilled because of potential contamination. Oil from the crankcase if filter before being used by the engine and any oil placed in the filter before installation goes to the engine without going first through the filter. Cumins is different.