The next thing that entered into my mind was Frenchie’s blown engine due,
in part (we think) to an Amsoil EOA57 filter. In researching and postulating over his trials and tribulations I concluded the following: 1) Yes, the obvious, why try to go that long on a filter, blah, blah, blah. In his defense he was following a non-traditional but reliably sourced alternative program. 2) If the bypass pressure of the EAO57 was lower he might not have blown the engine. Would he have had good filtration and adequate protection? Unlikely, he needed more media (bigger filter).
If I got it right Hastings and Amsoil filters are closely related. The EAO57 is probably the Hastings LF494 (which is unfortunate). It has a 20psi and is the filter Hastings thinks LF494 replaces the OE 90915-20004 and –YZZD3. The EAO57 is the filter that had issues that caused Amsoil to issue a TSB… By Hastings own catalog when you look up a 1GRFE filter it lists a LF589 which has an 14psi bypass, not a 20psi. Maybe the whole fiasco is a GIGO issue, maybe the 14psi is the correct number. Maybe, if the Toyota OE filters really bypasses at 20psi, Toyota needs to revisit that in light of oils getting thinner and the TSB authorizing 5w-20 in many of our 1GRFE’s. Either way something has been lost in translation.
I decided I wanted a bigger filter that would have the following attributes:
a) 1st class, reliable name brand.
b) Larger, taller etc.
c) A bypass lower than 20psi. (Most of the 1GRFE filters I looked at had a bypass rating of between 8 & 17psi. I’d like to be on the lower-end of that but that’s my choice.) With lots of media there’s no reason to have a high bypass pressure and it’s very unlikely you’d ever need to bypass.
d) No “dry starts” or delays in building oil pressure.