I've got a 97 F150,AUTO,LWB,XL,4.2...it just turned 75K,no problems,yet; how can i tell if the front timing cover gasket has been replaced? I dont know the previous owner due to buying it at a FORD dealership,and i'm hearing horror stories about antifreeze seeping past the timing gasket.Ive flushed mine and the level has not dropped.Also,i recommend using Motorcraft oil filters on this motor;any other filter causes clatter at start up,but i noticed the 400S i use prevents this.