We own one of those few FOMOCO products (a 1998 Lincoln Town Car 4.6 V8) that the original owner's manual calls for coolant meeting Ford specification WSS-M97B44-D. One such coolant is the Prestone DEXCool in the silver jug. This car had red coolant in it when we bought it 4 years ago, and I flushed and put in the Prestone DEXCool back then. A few month back the plastic intake manifold cracked so I replaced it (car was about 11 years old and 118,000 miles). I put the Prestone DEXCool back in the system. Gotta wonder if the DEXCool played a part in the failure, or was it just in service time and poor intake manifold design/material. The 4.6 engine was used in allot of Ford products, and allot of these vehicles did not use DEXCool but still had the plastic intake manifold failures (in less time/miles than my car). I think Ford had a recall for the plastic intake manifolds. So, can we really assume DEXCool (or any other coolant) is the most likley cause of a cooling system failure?