L loneryder Joined Apr 19, 2014 Messages 3,505 Location WV Nov 16, 2014 #1 Why is 5-20 HM only rated "SL" and regular 5-20 is rated "N"?? I checked Mobil 1 and a couple of others.
Why is 5-20 HM only rated "SL" and regular 5-20 is rated "N"?? I checked Mobil 1 and a couple of others.
V vinu_neuro Joined May 9, 2005 Messages 1,215 Location Chicago Nov 16, 2014 #2 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.
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.
L loneryder Thread starter Joined Apr 19, 2014 Messages 3,505 Location WV Nov 16, 2014 #3 Thanks. Makes sense.
T tommygunn Joined Jan 27, 2011 Messages 3,061 Location usa Nov 16, 2014 #4 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.
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.
