RTFM - that is the best advice to heed. I have owned and run many OS engines both ringed and ABC, though I am down to just two these days, both ringed, due to thinning out my collection.

Generally speaking, a person who invests in an OS engine does so because they want an engine that will give good service for a long time. That long relationship starts with with the all-important break-in period so getting it right counts for a lot. Ignore the impatient jokers who advocate running too lean too early - if they want to torture their engines to a premature death then that's up to them - that stuff is for cheap 'throw away' ABC engines and people with money to burn.

Manuals for most engines can be found online if you didn't get one with the engine.