Is it, or is it that Amsoil has confidence in their product and stands behind their mileage guarantee and makes no reference to having to worry about the "Warranty" period because they will pay out in the event of a problem, whereas M1 tries not to or tries to get out of it by stating that you should follow your OEM recommendations under the warranty period when we all know that OEM's can't deny warranty unless it is proven that the oil somehow failed to protect?
Why doesn't Mobil guarantee their product for the mileage without the OEM statement like Amsoil does? That's all I'm saying...
Is it because they (M1) don't believe in their product? Or because they want to claim it can do extended OCI's when it can't? Or because they want people to change their oil more often so they make more money?
Originally Posted By: Mobil1
ExxonMobil guarantees that the Mobil 1 Extended Performance lubricant you purchased will protect your vehicle’s critical engine parts from oil related failure for 15,000 miles or 1 year, which ever comes first. If not, provided the engine was serviceable at the time the oil was installed, ExxonMobil will have your vehicle repaired and replace the oil at no cost to you. Be advised that if your vehicle is covered by a warranty, you should follow the vehicle's oil life sensor or the oil change interval recommended in your owner's manual to avoid a disruption in your vehicle warranty.
Originally Posted By: Amsoil
Service Life
AMSOIL Signature Series 0W-30 Synthetic Motor Oil is recommended for extended drain intervals in unmodified(1), mechanically sound(2) gasoline fueled vehicles as follows:
• Normal Service(3) – Up to 35,000 miles or one year, whichever comes first.
• Severe Service(4) – Up to 17,500 miles or one year, whichever comes first.
• Replace AMSOIL Ea oil filter at the time of oil change up to 25,000 miles or one year, whichever comes first (other brands at standard OEM* intervals).
• In all non-gasoline fueled vehicle applications, extend the oil change interval according to oil analysis or follow the OEM* drain interval.
*OEM - Original Equipment Manufacturer
(1) Engines operating under modified conditions are excluded from extended drain recommendations. Examples include the use of performance computer chips; non-OEM approved exhaust, fuel or air induction systems; and the use of fuels other than those recommended for normal operation by the manufacturer.
(2) Mechanically sound engines are in good working condition and do not, for example, leak oil or consume excessive amounts, are not worn out, do not overheat, do not leak anti-freeze and have properly working emission control systems. AMSOIL recommends repairing malfunctioning engines prior to the installation of AMSOIL synthetic oils.
(3) Personal vehicles frequently traveling greater than 10 miles (16km) at a time and not operating under severe service.
(4) Turbo or supercharged vehicles, commercial or fleet vehicles, extensive engine idling, first and subsequent use of AMSOIL in vehicles with over 100,000 miles, daily short trip driving less than 10 miles (16km), frequent towing, plowing, hauling or dusty condition driving.