I agree with dustyroads that the 37K mile analysis looked better than the 50K mile analyses. Viscosity went up, which could indicate oxidation, and the higher viscosity could be affecting your fuel mileage, but probably not to the extent of 1 mpg. More concerning is the lead has been trending up since the 37K analysis, and the lead wear rate was higher during the last 50k interval.

TBN was still very high on the last analysis, but it would be nice to see a TAN number. Maybe high TAN is making the lead trend up?

Edited by A_Harman (07/25/14 09:18 AM)
1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck