OK, I've recalculated the A_Harman index using the PQIA values (and 0.851 for the density).
M1 5W-30 A_Harman index = 0.862
M1 EP 5W-30 A_Harman index = 0.872
M1 AP 5W-30 A_Harman index = 0.840
So, the A_Harman index is similar to the other varieties, although smaller.
My take:
(1) They used a thicker base oil to meet the dexos1 Gen 2 timing-chain test.
(2) There is a little more VII than in M1 and even more so than in M1 EP.
(3) Add pack is the same as in M1 and M1 EP.
(4) Base oil is thicker however inferior to that of M1 and even more inferior to that of M1 EP. There is probably little or no PAO.
Note that these conclusions of mine only apply to the 5W-30 viscosity grade.
And... I've just checked the ExxonMobil MSDS site and I was right!
M1 5W-30: 20% - 30% PAO
M1 EP 5W-30: 20% - 30% PAO
M1 AP 5W-30: 5% - 10% PAO
Annual protection? Hmm... This makes M1 vanilla 18-month protection and M1 EP 24-month protection then!
M1 5W-30 A_Harman index = 0.862
M1 EP 5W-30 A_Harman index = 0.872
M1 AP 5W-30 A_Harman index = 0.840
So, the A_Harman index is similar to the other varieties, although smaller.
My take:
(1) They used a thicker base oil to meet the dexos1 Gen 2 timing-chain test.
(2) There is a little more VII than in M1 and even more so than in M1 EP.
(3) Add pack is the same as in M1 and M1 EP.
(4) Base oil is thicker however inferior to that of M1 and even more inferior to that of M1 EP. There is probably little or no PAO.
Note that these conclusions of mine only apply to the 5W-30 viscosity grade.
And... I've just checked the ExxonMobil MSDS site and I was right!
M1 5W-30: 20% - 30% PAO
M1 EP 5W-30: 20% - 30% PAO
M1 AP 5W-30: 5% - 10% PAO
Annual protection? Hmm... This makes M1 vanilla 18-month protection and M1 EP 24-month protection then!