
Originally Posted by
Silver_Bullet
That Mobil 1 looks like a great choice. I wish the engineering guy had more recent tests of the typical oils we are using in the 5W40 and 0W40 range, I like his testing. I imagine since he prefers the 5W30 oils he's not going out of his way to test the choices typically used here.
I think you are right. He has a very well designed test. All oil is going to protect well when it is in liquid form (exception I will note in a moment). It’s when it’s in the ultra thin stage under pressure that it fails. That’s when it is squeezed, like during the power stroke of an engine pressing hard on the rod and main bearings, pressing the piston rings out against the cylinder walls and scraping downward, and between the cam lobes and lifters or followers. There are other parts of an engine where this can happen. The oil is micro thin under these conditions and under great pressure. That’s where and when oil fails and wear occurs.
Testing for true failure at high load pressure under actual and extreme engine operating temperatures makes sense.
Here is one exception his testing seems to overlook: Coking of engine oil in turbocharged engines. That’s not applicable to our engine, of course, but the center shaft of a turbo spins at well over 100,000 rpm and it’s bearings are fed by engine oil. The temperature of that shaft rises to as high as 1500 degrees F. Ordinary oils fail, leaving hard baked on carbon deposits. Water cooling can only help so much. Synthetic oils can survive higher temperatures.
I suspect some synthetics would perform differently if he tested high load oil film failure at turbo bearing temps. That might be of interest to the B9 guys and others running turbos.
I admit that I’ve not been an Amsoil guy, but I was impressed with the test performance of their two top oils. The problem I have with Amsoil is that I don’t know if their additive packages would be good enough to provide ANSI SN or VW502/503/505 protection for the full service interval period. To me, that’s where the industry and manufacturer certification has value, because quality over expected service interval is a part of the certification testing.
Yes, the great performance of lighter oils was a bit surprising, but the data is the data. I would suspect that as he keeps testing new oils he will encounter more wide viscosity 0w40 oils and we will see the results if we visit the blog regularly.
He is not just some tinkerer in a garage with jake leg home-made test equipment testing things that may or may not matter, and we can learn only so much from Blackstone testing new or used oil for the quantative presence of certain measured substances.
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