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Casting sand mostly. That's why I preach the coolant filter sermon. I just flushed my system 2 weeks ago and the coolant was crystal clear with nothing floating around or in the bottom of the drain pan. This included coolant drained from the pet****, lower hose and block plug. Filter was put on when the truck had 3,000 miles on it almost 5 years ago.
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2005 Lariet, 6.0, 3:73 1969 Mach 1, 428 CJ
1971 Triumph Trident(SOLD)
2007 Road King flhp
2007 Jazz 5er, 11k
173rd Airborne
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