Sounds like possible blow by. check your PCV system (hoses/PCV valve). How many miles on the motor???? My 7MGTE on my first supra had the same issue. It had about 230,000 and was on the way out......The brownish color usually comes from a mixture of oil and water from the blow by. A catch can helps out with the issue too.....
Last edited by OnyxBubble; 07-03-14 at 04:24 PM..