I own a 2006 GMC Canyon with 18500 miles Yesterday I checked the engine oil and found a white froth on the dipstick. The froth was light tan in color and was soft to the touch. I believe this is a sign of water or coolant escaping into the oil. Anyone else have this problem or heard of it? I changed the oil myself at 13500 and 16500 miles. The last oil change was on March 3 2009. I have an appointment at dealer and need info as I do not trust service dept at local dealer.