Tokyo Roki Oil Filter Efficiency Rating

[Roberts9156]

Anyone know the efficiency rating of Tokyo Roki oil filters? Is the media synthetic blend?

 

[ZeeOSix]

Good luck finding actual specifications. This is all the Tokyo Roki website shows. I'd theorize they are going to be near the bottom the efficiency spectrum.

https://www.roki.co.jp/ver11-en/product_info/filter_model

You could try sending them the questions through their website contact form.
https://www.roki.co.jp/ver11-en/call_us

 

[SilentType]

While filtration efficiency is important I think that in the current oil filter world, construction quality might take precedence.

 

[KevinDM]

Here’s a video from Whip City Wrencher of a used Roki filter cut open.

 

[grabgears6]

the recent OCI service on our 2025 Crosstrek W. The A21 is made in Indonesia.

 

[twX]

They do use synthetic blend media. WCW has cut open a few unused Tokyo Rokis on his channel. Under the microscope, the media porosity seems to range from pretty average, to pretty high, depending on the filter. They certainly don't have high efficiency. Construction quality is excellent though.

 

[kschachn]

Anyone know the efficiency rating of Tokyo Roki oil filters? Is the media synthetic blend?

Nope. If you can obtain it from the manufacturer let us know.

 

[ARCOgraphite]

~ GIVE ME LOW EFFICIENCY OR GIVE MY ENGINE DEATH ! ~

I do NOT want low porosity on sub 150sq in pulp/glass blend resin-bound media.
I DO wish these were a larger form factor and loaded with thick synthetic media with a higher efficiency
_______________________________________________________________________________________________________________

 

[97prizm]

Nope. If you can obtain it from the manufacturer let us know.

After some digging google pointed to Flatirons tuning blog, and New Provisions Racing, claiming.
"

• "Micron Rating: Often cited around 20-21 microns.
• Construction: Feature metal support structures, unlike some cardboard-based alternatives.
• Performance: Known for high efficiency (95%+ in some studies) and quality construction." So maybe they winged it or maybe they were actually able to get the actual filtration ratings.

 

[Fair enough]

Here’s a video from Whip City Wrencher of a used Roki filter cut open.

I think they take the prize for the most open pores of any oil filter? This open structure would be especially bad for the lab efficiency test where the particle concentrations are artificially high, but the question remains as to what is the efficiency in actual use on an engine? We know they and other Japanese manufacturers are perfectionists and highly capable, so why do they purposely choose to use something that looks like this?

 

[ZeeOSix]

If it's inefficient in the lab, it's also inefficient in real use. Plenty of in field study data showing the UOA particle count is higher with less efficient oil filters. A low efficiency oil filter will not result in the same level of oil cleanliness as a higher efficiency filter.

 

[kschachn]

If it's inefficient in the lab, it's also inefficient in real use. Plenty of in field study data showing the UOA particle count is higher with less efficient oil filters. A low efficiency oil filter will not result in the same level of oil cleanliness as a higher efficiency filter.

I’m glad you explained that to this particular member.

 

[Fair enough]

If it's inefficient in the lab, it's also inefficient in real use. Plenty of in field study data showing the UOA particle count is higher with less efficient oil filters. A low efficiency oil filter will not result in the same level of oil cleanliness as a higher efficiency filter.

You don’t address artificially high particle concentration. High concentrations find more pores more often. Not the same as actual engine conditions in modern times. I am not going back and forth about it. In fact when I wrote my post I predicted this.

 

[ZeeOSix]

You don’t address artificially high particle concentration. High concentrations find more pores more often. Not the same as actual engine conditions in modern times. I am not going back and forth about it. In fact when I wrote my post I predicted this.

I said in field study data (ie, filters on engines in real life use) .. that is not "artificially high particle concentration". Like said, if a filter is testing inefficient in the lab then it's also going to be inefficient in the actual use. Believe it or not, there is a correlation between ISO 4548-12 and the real world. Why would the ISO test be around for over 25 years and be used around the world as an international standard otherwise.

Show me one study of actual engines in the field that show the oil cleanliness was the same regardless of the oil filter efficiency. Have you even search, found and read any of these engine wear studies. I've posted about them for years, and I'm sure you've seen some of the postings of what they show.