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Read our primer articles on High Mileage Oil, Synthetic Oil and Kinematic Viscosity

Within the past two weeks, we've been able to see the new SN oils from Mobil and Amsoil. Very different additive packages.

Mobil 1

Moly 77
Boron 92
Calcium 1015
Mg 746
P 675
zinc 812
Tbn 9.3

Amsoil SS

Moly 130
Boron 232
Calcium 3251
Mg 12
P 652
Zinc 763
Tbn 12.6

Mobil 1 is using Mg, which I thought was going away for good in PCM's. Amsoil now looks like Mobil 1 from 2005.
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quote:
Amsoil now looks like Mobil 1 from 2005.

Wow, that is a leap in logic! You compare 6 elements and TBN value, and know nothing of the other elements, chemical additives, base oils and performance.

The total package performance can better be compared with standard ASTM tests, recommended oil change intervals, and warranty coverage, in which AMSOIL always trumps Mobil 1, for the past 36 years.

The additive packages are different because AMSOIL Signature Series is a 25,000 mile/1 year oil and Mobil 1 EP is a 15,000 mile/1 year oil, and Mobil 1 is a 10,000 mile/1 year oil.
Last edited by timvipond
Hey Buster, been a long time . Just a quick post then off i go but >>>>

Looks like Mobil is using a different dispersant/ detergent pack , similar to what Maxima has been using in their <10w-40 Extra> for years now. Lower starting TBN that hangs in longer and all that goes with it, less the viscosity of course.

Perhaps starting vi @100c will trend lower as well as phos amounts are lowered.

Sulphonates out-Salicylates in ?
Hi Motorbike, good hearing from you. I thought the TAN was high too. Thanks for the tid bit on Maxima. Interesting. I agree with what you said about the detergent/dispersant.

With lower sulfer levels in fuel, blowby will be less acidic so lower TBN is ok. TBN retention is more important though so it should be interesting to see how it holds up. The sulfated ash is lower with he Mobil formulation.
Last edited by buster
quote:
Originally posted by Tim Vipond:
quote:
Amsoil now looks like Mobil 1 from 2005.

Wow, that is a leap in logic! You compare 6 elements and TBN value, and know nothing of the other elements, chemical additives, base oils and performance.

The total package performance can better be compared with standard ASTM tests, recommended oil change intervals, and warranty coverage, in which AMSOIL always trumps Mobil 1, for the past 36 years.

The additive packages are different because AMSOIL Signature Series is a 25,000 mile/1 year oil and Mobil 1 EP is a 15,000 mile/1 year oil, and Mobil 1 is a 10,000 mile/1 year oil.
Up to TIM . It is UP TO miles or year.

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