Here is a good reply at another pakwheel forum about your qjestion... .
shuja11
PakWheeler
Feb '141
mashriqain;4235605:
Okay, so I have been looking for information regarding Genuine Toyota Oil Filters, specifically for 1NZ-FE engine. There are two variants:
Part No. 90915-10003
Made in Japan (costs 800 Rupees from genuine part dealers/about 1200 from Toyota 3S)
This is the same part no. as Toyota catalog for Axio
Part No. 90915-YZZE1
Made in Thailand (costs about 400 Rupees from genuine part dealers)
I have mostly seen Thailand made oil filters in oil change shops. They give option of Leppon filter but I was not given an option of Japanese Toyota oil filter. The main difference between the two seems to be the element inside, pressure plate and relief valve. Thai made is cheaper, probably because it is sort of a paper? and I suspect it will be prone to holes. I intend to dissect the oil filter once I go for next oil change to see what has happened to it.
I am really interested in knowing the exact technical difference between the two. Whether it is safe to use the cheap Thai made oil filter, still a Toyota product for 5000 km interval. Other things like micron rating, by-pass valve setting, flow rate etc. of the two. So far I have only found one website, in Russian which has compared oil filters of different brands. The pictures attached here are all taken from the same website:
Link-1
Link-2
From Google's translation of the site, I understand that the Thai filter's pressure plate also serves as the relief valve i.e. no dedicated relief valve. (This obviously is another cost saving step) While on Japanese, the pressure plate is separate and relief valve is embedded within the filter element. Can someone please tell me the pros/cons of pressure plate serving as a relief valve as well?
Here's what I am talking about, Japanese (pressure plate is to the right of filter, relief valve is embedded on top of the filter element):
Thai (nothing in the filter element, the pressure plate is also relief valve):
and some more detailed images
MADE IN JAPAN
Close up of the filter element. Relief valve can be clearly seen there, the coil thing.
MADE IN THAILAND
Nothing embedded in filter media. Pressure plate to the right also serves as relief valve
Close up of the filter element
Thank you for reading the topic. Looking forward to gain knowledge about this from everyone who can participate.