LogGrad98
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Oats do not lead to "contamination" in beer. Oats are used frequently in beer, especially porters and stouts. They create a distinctive mouth-feel that some people describe as being slick on the tongue. I'm not sure what it is about the manufacturing process that would cause perfectly harmless oats to contaminate a beer, but if that's a concern, buy your oats from a brew supply store. I'm sure their supply will be beer friendly.
I think he is talking about the processing of oats contaminating the oats themselves, which could in theory translate to the beer. I don't think he is saying that if you use oats in beer they automatically contaminate the beer.