Originally Posted By: Oldwolf
European formulas have higher ZDDP and TBN I think.
Depends on what specs it meets. Some oils meeting low and mid_SAPS Euro oil specs have lower ZDDP and TBN than any of the usual API SM/GF-4 oils. Your comment is true for Mobil 1 0W-40 and GC compared to the usual API SM/GF-4 oils.