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0.020
Almost all (if not all) B&S engines have a .030 plug gap.
Champion Spark Plug QC12YC
To Determine what spark plug is in your 16hp enging you would need to be more specific. It could have a Briggs and Stratton engine or it could have a Kohler engine. Both engines use different spark plugs. The spark plug for the Kohler engine is part number 32295-1. The part number for the B&S engine is 43591-7
The engine is flooding or the spark plug is fouled and not burning all the fuel, allowing the excess gas to seep into the oil reservoir via the piston cylinder. Cleaning or changinge the spark plug and doing a carburetor adjustment will help.
The proper spark plug for 4hp Briggs & Stratton is a J8 which I use in all my motors.
You can cross reference a RC12PYP3 or RC12YC non-platinum spark plug for a Briggs 696798. The Briggs Platinum 696798 spark plug is for a snow blower. Part number 696020 for a Platinum plug from Sears is an equivalent also.
what is the champion cross reference for a briggs and stratton spark plug 691043
Champion RJ19LM
Champion rj19lm
493880S
Rc12yc