What is the difference between a 'micron rating' and 'beta ratio test' when referring to filters? A filter’s micron rating refers to the smallest size contaminant the filter media can remove; however, there is no correlation between micron rating and a filter’s efficiency percentage.
The beta ratio test measures a filter’s efficiency for removing particles of a certain size by comparing the amount of contaminant particles before and after filtration. The number of particles after filtration is divided by the number before filtration. The resulting number is the beta ratio. AMSOIL filters have a minimum beta ratio of 75, meaning they are capable of removing 98.7% of contaminant particles of a stated size.
What is the service life of AMSOIL Ea® Oil Filters? When used in conjunction with an AMSOIL extended-drain motor oil, Ea filters designated with product code EaO are guaranteed for up to 25,000 miles/one year in normal service and up to 15,000 miles/one year in severe service. Ea filters designated with product code Ea15K are guaranteed for up to 15,000 miles/one year, whichever comes first, regardless of driving conditions. It is recommended that all AMSOIL-brand oil filters be changed when the motor oil is changed. If motor oil other than AMSOIL is used, AMSOIL Oil Filters must be changed according to the vehicle manufacturer’s recommendations.
Is it okay to use non-AMSOIL brand filters with AMSOIL lubricants?
Yes. In gasoline applications, change the non-AMSOIL brand filter at one year/12,000 miles, whichever comes first, when using AMSOIL XL or Signature Series Motor Oil. In diesel applications, follow the OEM filter change interval.
Can a larger size filter be used in place of what a vehicle calls for?
No. Filter recommendations by AMSOIL are based on specific equipment manufacturer requirements. Using a filter in an application it is not recommended for will void the filter’s limited AMSOIL warranty.
How long can oil drains be extended when using a bypass filtration system? AMSOIL Bypass Filters are designed to filter out fine particles; they are not meant to extend oil change intervals beyond original recommendations. However, when fine particles are filtered out of the motor oil, it may be possible to attain longer drain intervals. This should be determined by used oil analysis. In addition, the use of an AMSOIL bypass system may allow for the use of larger oil filters, which can increase filtering capacity.