I've pulled both spec sheets and both of these European 0W-40's seem very similar. I like both oils and I use both depending on the mood I'm in at the time. Well, actually I probably use Mobil1 more often as Walmart is 4 miles from my garage and Amsoil is 30 miles from my garage. I have both in my garage at present. I'm not a fan boy of either. I'm not trying to cause any problems. I probably have a slight emotional connection to Amsoil as the dealer is a great guy. Just trying to be as honest as possible.
The only "big" difference I see from the Technical Properties sheets on each one is that the TBN is 11.8 on the Mobil1 and 10.1 on the Amsoil. Amsoil says there 0w-40 is good for Renault and MB 229.1 and Mobil1 is good for Nissan GT-R. Viscosity's are the "same." Shear is the "same." VI is the "same." I couldn't find the Noack Volatility on the Mobil1.
I merely want to know the meaningful physical/chemical differences between these 2 oils.
The only "big" difference I see from the Technical Properties sheets on each one is that the TBN is 11.8 on the Mobil1 and 10.1 on the Amsoil. Amsoil says there 0w-40 is good for Renault and MB 229.1 and Mobil1 is good for Nissan GT-R. Viscosity's are the "same." Shear is the "same." VI is the "same." I couldn't find the Noack Volatility on the Mobil1.
I merely want to know the meaningful physical/chemical differences between these 2 oils.