you dont have to use blackstone you know. i used butler labs recently and trust them more than blackstone as far as being consistent.
honda gf-3 5w-20
iron - 1
moly - 102
potassium - 1
boron - 63
si - 3
sodium - 243
calcium - 1467
mag - 6
phos - 590
zinc - 675
exxon 5w-20 unknown gf
iron - 1
moly - 109
potassium - 1
boron - 65
si - 2
sodium - 249
calcium - 1237
mag - 3
phos - 520
zinc - 620
these two links show them being very close. im sure theres more out there as well.
exxon
honda
honda gf-3 5w-20
iron - 1
moly - 102
potassium - 1
boron - 63
si - 3
sodium - 243
calcium - 1467
mag - 6
phos - 590
zinc - 675
exxon 5w-20 unknown gf
iron - 1
moly - 109
potassium - 1
boron - 65
si - 2
sodium - 249
calcium - 1237
mag - 3
phos - 520
zinc - 620
these two links show them being very close. im sure theres more out there as well.
exxon
honda