Here is what the TSB from Amsoil says:
Technical Service Bulletin
Date: 06/30/2009 Product Description: AMSOIL EaO09, EaO10 and EaO57 Oil Filters Subject: Toyota Applications
OBJECTIVE:
Inform customers of an issue regarding the oil sensor tripping in the following applications: • All Toyota/Lexus Vehicles • Pontiac Vibe Featuring the 1.8L Toyota-Built Engine.
ISSUES:
A small number of customers with Toyota, Lexus and Pontiac vehicles 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.
TECHNICAL DISCUSSION:
To protect the engine, the OEM has engineered the oil pressure sensor to trigger the oil light when there is insufficient oil pressure to maintain an adequate level of protection. Each filter is equipped with a by-pass valve, so when the filter is at or close to capacity, the engine is continually supplied with adequate lubrication oil, although unfiltered. However, if the filter reaches maximum capacity, the level of restriction can become significant enough to trigger the oil pressure warning light. In extreme situations, oil starva- tion could occur.
Premature oil filter capacity can be attributed to a number of factors such as poor air filtration, a leaking air intake system or excessive contaminants being produced in the combustion process. As discussed in the AMSOIL Technical Service Bulletin Using AMSOIL in Engines with Possible Sludge Issues,1 certain engines are prone to accumulate sludge, including some engines from Toyota/Lexus.
RECOMMENDATION:
When used in conjunction with any Toyota/Lexus applica- tion, or with the Pontiac Vibe featuring the 1.8L engine built by Toyota, AMSOIL recommends changing EaO09 and EaO10 Filters per the OEM-recommended change inter- val. AMSOIL no longer recommends the EaO57 Oil Filter
for Toyota/Lexus applications, however, it is still recommended for other applicable vehicle makes and off-road equipment. Customers operating any of the above listed applications with an EaO09, EaO10 or EaO57 Filter in service beyond the OEM-recommended interval should change the oil filter at the earliest opportunity. If the oil light is triggered the filter should be changed immediately to avoid damage. AMSOIL also offers WIX Filters as an al- ternative to the Ea Filtration line and recommends the WIX 51348 Oil Filter for Toyota/Lexus applications that previ- ously called for an EaO57 Filter. If a WIX Oil Filter is used, AMSOIL recommends changing it at OEM-recommended intervals.
REFERENCES:
1AMSOIL Technical Service Bulletin Using AMSOIL in Engines with Possible Sludge Issues, MO-2005-09-29, 09/29/2005
I use the Ea034 Filter which is longer than the Ea057. More filter, no issues on any Toyota that I run this filter on, the '05 4runner w/46K and '93 T100 w/258K and no oil issues or oil pressure issues to date. However, I do have one 2008 Toyota vehicle that use the Ea009 filter. I have 32K miles on it, and have changed that filter once every 6 months with no ill results. I have not experienced the "oil light" coming on and hope that I don't, but then again I am anal when it comes to maintenance on my vehicles. I put about 25K miles a year on this vehicle, mostly highway miles.
