First sample with Castrol Magnatec. Oil is 5W-30, full synthetic (old formula; not SN+). I've shifted gears from my previous testing and now plan to run the oil until my OLM gets to 20%.
Oil was run for 6,811 miles over 153 days. It ran for 251 hours, including 61 at idle (24%). OLM was at 18%. I did a few hundred miles of towing, but otherwise just the same normal commuting as my other samples. Some have claimed this oil quieted their motor down, but I didn't notice anything different. One batch isn't a trend, but this sample has lower wear metals than the M1 or Schaeffer's averages of my previous testing, so I'm happy with that direction. Especially since this is the longest I've ever run a batch (measured in both miles and OLM remaining). The iron average of my three M1 samples (covering 15,700 miles) was 3.2ppm/1k miles, Schaeffer's was 4.2ppm/1k miles (15,400 miles between the three samples) and this Castrol sample was 2.5ppm/1k miles.
Oil was run for 6,811 miles over 153 days. It ran for 251 hours, including 61 at idle (24%). OLM was at 18%. I did a few hundred miles of towing, but otherwise just the same normal commuting as my other samples. Some have claimed this oil quieted their motor down, but I didn't notice anything different. One batch isn't a trend, but this sample has lower wear metals than the M1 or Schaeffer's averages of my previous testing, so I'm happy with that direction. Especially since this is the longest I've ever run a batch (measured in both miles and OLM remaining). The iron average of my three M1 samples (covering 15,700 miles) was 3.2ppm/1k miles, Schaeffer's was 4.2ppm/1k miles (15,400 miles between the three samples) and this Castrol sample was 2.5ppm/1k miles.