In the last year, AMSOIL has issued two technical service bulletins recommending that motorists change their EAO oil filters at the OEM-recommended service interval. Witness:

TSB: EAO Oil Filters – Toyota Applications

TSB: EAO-13 Oil Filter Service Interval Change

Simply put, some deposit prone vehicles can bring a few of the smaller filters to capacity before their time. Not every model listed was an issue and the occurrence of illuminated oil pressure lights is rare, but AMSOIL took the safe road by making a broad recommendation. They are now going to re-design some of these smaller filters. It will be interesting to see what comes out of this and what sort of service interval will be attached to these new units. Stay tuned…

Here is the statement from the company:

As previously announced, a small number of customers with vehicles from Honda, Acura, Toyota, Lexus and Pontiac (with Toyota-built engines) have reported that their vehicles’ oil pressure light has illuminated prior to reaching the end of the AMSOIL-recommended 25,000-mile drain interval (see announcement). These issues have been limited to a few smaller Ea Oil Filters (EaO13, EaO09, EaO10 and EaO57) and do not apply to the entire Ea Oil Filter line. The smaller filters can potentially fill with contaminants rapidly and limit the oil supply to the engine. Although these issues have only been reported in a few extreme cases, AMSOIL has taken steps to limit use of the affected filters on vehicles where these problems have occurred. AMSOIL is currently re-engineering the affected filters and replacements will be available as soon as possible. In the meantime, AMSOIL offers both WIX and MANN oil filters for the affected applications. If a WIX or MANN oil filter is used, AMSOIL recommends changing it at the OEM-recommended interval or 7,500 miles, whichever is longer, when using AMSOIL synthetic motor oil*. Check the AMSOIL Online Product Application Guide for the most up-to-date application information.

*Note: In gasoline-fueled vehicles, AMSOIL XL Synthetic Motor Oils are recommended for 7,500-mile/six month oil change intervals, or longer where stated by vehicle manufacturers or indicated by electronic oil life monitoring systems. Change aftermarket, OEM or AMSOIL Ea Oil Filter at every oil change.