Oil Change

Originally Posted by Jesse

Because, if oil does well in the harshest environment or running condition, then it must be EXTRA good when just cruzin around.

Originally Posted by Resolute at my350z

Here's a comparison chart I've made to highlight oils whose results, when averaged according to engine wear for every 1000 miles of use, stand out as a significant statistical difference from the mean. I divided the engine wear for each metal by the mileage for each and every UOA I have, and then multiplied that by 1000 to generate a ppm for every 1000 miles driven. I then found the average for each wear metal (iron, copper, etc..) for all the UOA results and the standard deviation of each wear metal result from the average. This chart shows the average wear for each current oil tested in terms of ppm/1000 miles. The cells with a green background are better than one standard deviation from the average. The cells with a red background are worse than one standard deviation from the average. The average and SD, remember, is calculated from ALL the samples I have from the VQ. The average wear characteristics of some oils used in the VQ which are no longer in production I have also included in a separate table.

The interesting thing is to note which oils are statistically significant in terms of better or worse wear from the universal average for each wear metal. It would be nice to have multiple samples from some of these oils before the manufacturer changes formulas again.