Posted by MeanGene1 on January 01, 2011 at 14:37:35 from (71.141.248.116):
In Reply to: 15-40 VS 5-30 posted by rick165 on January 01, 2011 at 07:19:17:
Machining procedures have improved greatly and tolerances and clearances have been tightened quite a bit, such as bearing clearances. Run heavy oil in bearings with tight clearances and you run the risk of spinning bearings. It's not unusual these days to pull a modern gasser down with over 100K and it's in very good shape, if it's been run with the right oil and changed often. The days of big tolerance ranges and long break-in periods are long gone. Mileage and longevity standards, new regs for cat converters, use of roller cams, all factor in.
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