Originally Posted By: bubbajoe_2112
I don't plan on running anything other than 0W20 or 5W20 again. This was an "experiment" mainly to see how a high HTHS/viscosity oil performed in this engine and it's effect on MPG (lost about 1 MPG). FYI, I ran M1 5W20 since new for 14 changes at about 7500 mile intervals (the normal MID interval for me) before trying the 0W40.
The interval was longer, but the increase in Fe and Cu was not proportional. I'll have to read up on the M1 and Fe connection mentioned by LeakySeals, but if that's the case, why didn't M1 5W20 have elevated Fe?
I wonder if the 0W40 was just to thick and couldn't provide adequate lubrication? Just a guess, and again, very interesting results but not conclusive. I will probably be sticking with the Honda oil since I can get it from my dealer's bulk supply for $2.41/qt (5W20) or $3.41/qt (0W20).
Perhaps the minor elevation in wear metals is due to start up,and the oil taking that few minutes longer to reach operating temp.
The elevation in iron is minor since the oil was run longer.
This uoa may not mean much however it does lend credence to caterhams thin ideas.