a cracked gasget could cause that
chemical
Possibly the boiler is firing oil and thus the soot from the oil is spilling back into the gas flue
the khara.
If you have gas in your oil pan, then you probaby have gas in your oil. if you have gas in your oil, then you either have bad piston rings, or a bad carburetor (or injectors if the engine is newer). The way to check if you have bad piston rings is to see if you're blowing blue smoke out of your exhaust.
Well No Expert Here But If Your Getting Lots Of Gas In Oil If 1 Plugs Not Firing It Allows The Unburned Gas right Into Oil ItSelf.. Check That All 4 Sparkplugs Are Firing That First Thing To Check
Bad Apex seal
Bad float valve in carb
Loss of oil due to a leak, loss of nitrogen gas, or contamination of the oil inside the shock.
Two cycle engines have an oil gas mixture and if there is too mush oil to gas you will see it burn as white or gray smoke That or your valves are bad.
Stuck choke or bad petcock.
What causes a misfire can be a number of things. But from what you are telling me, you may have water in your oil and maybe some bad gas inside your engine. If you have pumped in some bad gas, you may have a filed out the sparkplug at that #8 cylinder.
Float needle sticks in carb and allows excess fuel to seep past rings into oil.