An FYI for anyone curious about oil change intervals. I usually take some oil samples periodically so I know my oil change intervals are acceptable. Below is a used oil analysis from my 2013 LSV with the 345 surf engine. This sample had 82 hours on it. This was Rotella T5 synthetic blend. My next report will be with T6 full synthetic. Basically, the report says this interval is OK going forward assuming fuel and wear does not worsen in future testing.