Hello all. Long time lurker here, I really enjoy reading you guys posts. But now I need some help. I have a 2005 toyota tacoma 1GR-FE engine. At 55,558 miles the crankshaft main bearings were wiped. I bought this truck used with 5200 miles on it. I changed the oil every 5k or so with PP OR M1 5-30. Whatever one was on sale. I became financialy embarassed so to save money in the last 3 oil changes I went from super tech full synth. To mobile clean 5000 on the last two changes. 2,170 miles into the second Mobile clean change was when the engine let loose. I can't believe it was a lubrication failure so what could it have been? I can't get any info from the dealership.(Toyota repaired under warranty) Next question, I took possesion of a 1982 delta 88 with a 307. 26,600 original miles. Pennzoil yb 10-40??? Thanks in advance.