Difference in 5-20HM and 5=20

Messages
1,132
Location
Chicago
The high-mileage oils have higher sinc and phosphorous concentrations than permitted for 20wt and 30wt SM/SN oils. This gives them greater anti-wear and anti-oxidant performance.
 
Messages
3,061
Location
usa
Same goes for the 5w30 and 10w30 versions, too. Note that M1 HM 10w40 is SN because the heavier oils are allowed to have more ZDDP than the lighter stuff.
 
Top