I just replaced the BEB's on my 1hdt with 160k klm. There were several with small pitting. #2 top was the worst. My oil gauge had been reading low since I got it but I figured it was just a faulty sender. Fired it up and found my oil pressure had improved. Before my reading at idle was almost bottomed out and running at 2000 rpm was just below the 1/3 hash mark. Now at idle it is sitting at 1/3 and 2000 rpm is about 1/2. Glad I got around to changing the bearings, probably did not have much life left.