2000 miles of M1 HM 5W20 - oil is quite brown

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That would be my best guess. Some oils darken quicker than others also your engine may be clean and the oil is conditioning seals and such.
 
Originally Posted By: ford46guy
Installed in 98 MGM. Engine looked clean thru the valve cover. I guess it is cleaning things out?


I wouldn't be too worried. In my wife's 97 civic I used Mobil 1 5w-30. After 1500 km of short tripping the oil was dark. No sludge or varnish under the valve cover.
 
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