my 97 4.0l 4x4 has 180,8xx miles on it and i still take it off road and drive it trough water and mud nothing has been replaced or changed on it that i know of ive even had water come up over the hood cause i hit a really really big water puddle really fast and almost flooded the engine but its still running good

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97 ford ranger extended cab 4X4 4.0[sold]
1999 ford f150 extended cab 4.6 3 inch body lift 35 inch tall goodyear wranglers 4X4 straight pipe
1998 ford mustang V6 3.8l automatic
mainly stock except high performance headers, performance chip,flowmaster delta 40 series muffler