Lew Hodgett wrote:
A little tip for users of eng-gen sets.

Change the oil every 40 hours of operation.

Use SAE-30, non-detergent.

The above from the owner of a small engine service center.

Don't do the above, you wear out the connecting rod bearing(s).

I learned this the hard way.
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"Larry W" wrote:

May apply to some make/models such as those using B&S flathead
engines
but Honda for instance specified 10W30 API service SJ oil. Best to
check manufacturer's specs, not use a blanket recommendation.
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What does Honda say about oil change frequency which is what the owner
of a small engine service center was concerned about?

10W30 provides low viscosity in cold climes during winter months.

Wonder if that was reason for suggesting it?

Lew