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      02-20-2013, 02:37 AM   #19
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Drives: 2012 Z4 35i
Join Date: May 2008
Location: San Diego CA

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Originally Posted by ChRR1000S View Post
Any other suggestions?
Do a used oil analysis for the OE oil and replacement aftermarket oil under the same oil change interval and usage pattern.

Great way to let you know whether or not the change in oil was beneficial through the change in trace wear metals, remaining additive package and physical characteristics of the oil (i.e. whether or not oil sheared down to a lower viscosity)