While I realize that the subject of oil has been debated here ad nauseum, I am considering switching to synthetic oil in my '87 Grand Wagoneer AMC 360. The GW has 183K, but the engine is strong and clean, and it is unknown whether or not the engine has ever been rebuilt. I am, therefore, concerned about switching if in fact the
183K is the actual mileage on the engine; however, I am convinced from years of use in other vehicles that a top-grade synthetic like Mobile 1 or Rotella-T is a superior lubricant, and I would like to have that benefit, if possible. It is worth noting that the engine does not leak, and uses little oil, that it does use seems to be bypassing the rings on cold start, and this might be helped by the switch to a better lubricant.All thoughts will be appreciated.