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Old 05-31-2012, 07:23 AM   #52
rwidman
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City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
The problem with this test is, more than one variable was changed. The Walmart oil was, of course, a different brand. It was also a multi viscosity oil and a synthetic. Which of these variables made the difference? And how was the difference determined? With test instruments?

Was the improvement on startup (possibly explained by the multi-viscosity oil) or at all times? Was a test conducted with conventional multi-viscosity oil?

For a valid test, there would be only one variable at a time, instruments would be used to record the sound and "smoothness", and the test would be repeated on multiple engines.

If the OP is convinced that Walmart multi viscosity synthetic oil is an improvement, he should put it in his other engine and continue using it. We all have our favorites, that is why there is more than one brand on the shelf.
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