While two quarts of oil may be the minimum to sustain some level of lubrication it will not provide the necessary cooling nor allow for the C-90/O-200's higher RPM's and the tendency to foam. That's why most C-90/O-200's have 6 quart sumps on them from the factory. I'd suggest a trip to an engine shop with a test cell where the engines are run for 2-5 hours
prior to being bolted to an airframe. You can see first hand what too little oil does to the cylinder temperatures. I can suggest that sometimes we have used a shop-vac to pressurize the breather line lightly and using light soapy water find some leaks typically around the pushrod rubber seals and also loose pushrod tubes. We just had an engine with leaks around the starter and mags typically overlooked when leak hunting./tom
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