Originally Posted By: Liquid_Turbo
Hi guys,
I found something interesting..
"AMSOIL stands apart from the competition.
AMSOIL has always formulated its products to be the absolute best, continually researching ways to make its already outstanding products even better. Other oil companies, however, are beholden to shareholders, and one could speculate that their incentive is to maximize profit. They formulate oils down to a price, rather than formulating them to be the best they can be. Then, they price their products to maximize profits. In addition, AMSOIL has 33 years of experience blending premium extended drain synthetic oils. That’s 33 years worth of proven performance in the field.
A close look at ExxonMobil’s new long drain motor oil line reveals that two are petroleum based, one is a synthetic blend and only one, Mobil 1 Extended Performance, is a full synthetic. The petroleum based products are recommended for 5000 mile drains, the synthetic blend for 7500 mile drains and Extended Performance for 15,000 mile drains. However, a look at the fine print reveals that ExxonMobil is still recommending drivers follow the oil drain recommendations listed in their owners manuals during the warranty period. AMSOIL synthetic motor oils are recommended for 25,000 mile or one year drain intervals in both new and older vehicles. The AMSOIL warranty stands behind this recommendation."
From
http://www.bestsynthetic.com/mobil_ext.shtml
Is this enough proof to safely say that M1 EP is Group IV?
Any M1 grade that says Supersyn on the label is PAO based.
Exxon-Mobil suggests you follow the MANUFACTURER's warranty requirements to maintain your new vehicle warranty. Amsoil offers their own warranty; since following their extended drain schedule will invalidate your factory warranty.