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Message: <blockquote data-quote="jmatt20" data-source="post: 64126" data-attributes="member: 186"><p>someone posted this problem before ...not sure how it was resolved ..in my case i had an 843 with the same problem ..mine was caused by a cold weather by pass valve in the system ..it looked like a T in the return side of the system with one hose leading to the reservoir...it had something stuck in it holding it just a little open .. causing the oil to squirt into the reservoir return side and thereby foaming ....took me some little time to find the problem ...did all of the checks you have done ..to no good result ....at the time something like an 80/100 dll part</p></blockquote><p></p>