Was hoping for a little better, but this isn't bad. TBN has held up well which was my concern for ACEA C3 oil on US gasoline containing more Sulfur than diesel fuel. The Jeep is driven mostly in town averaging about 30mph speeds. One way commute is 7 miles. 30 mile highway runs during weekends. Incidentally, manual says it's ok to use 5w30 ACEA C3 in the Jeep. You kind of have to read between the lines because they say "SAE 5W-30 engine oil approved to Fiat 9.55535-S1 or Fiat 9.55535-S3 may be used when SAE 5W-20 engine oil meeting MS- 6395 is not available." What you'll find is that 9.55535-S1 are ACEA C2 oils and 9.55535-S3 are ACEA C3 oils.