What kind of oil do I use in the Coleman powermate 6875?

One note about oil using a detergent oil is not recommended for small air cooled motors because the detergent turns to carbon and builds up on valves etc. Non detergent is all you should use in small air cooled motors they will last twice as long at minimum. 25 years as mechanic has taught me some things. :)

You can use numerous engine oils. 10W - 40, 30W Detergent, 30W Non detergent (SAE)
The best all around above 40 deg F and below 100 F oil to use is a 30W detergent oil. Brand name does NOT matter. Oil level should be checked EACH time you add fuel. Change oil any time the oil appears Dark BLACK when checked regardless of the hour intervals. .

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Kelly