On my 16 kw Generac standby generator, today we had a 100 minute power outage, but my unit did not come on. Error message: low oil pressure. Oil level seemed unusually low, so I added about a half quart. When I did a manual start, oil spewed out of the oil pressure sensor switch. Apparently a common poorly made or designed part. I was able to run the generator by disconnecting the two sensor leads, installing a brass plug and running it in Manual mode. Naturally the power quickly returned. Got a replacement sensor late in the day for $27. Too hot this afternoon. I'll install it tomorrow.