Perhaps like many of you I once thought filtering didn't do much or anything to increase longevity of an engine.
Thinking about it more....eventually most cars use more oil with age. My Subaru with 195K miles on it now gets a diet of 40wt oil. Consumption is around 4000 miles per quart with it. Compared to 2000 miles. In high speed on 30 wt oil it used a quart every 300 miles. That no longer occurs.
I thought like that at one time. Fram Ultra is one of probably a few filters I know of that clearly states you filter 20 microns@ 99%.
and
https://www.machinerylubrication.com/Read/30697/choose-oil-filter
"Typical automotive oil filters remove particles 40 microns and larger."
"AC Delco Division of General Motors tested diesel engines and found an eight-fold improvement in wear rates and engine life with lower lube oil contaminant levels. In a related study on both diesel and automotive engines, General Motors reported that "compared to a 40-micron filter, engine wear was reduced by 50 percent with 30-micron filtration. Likewise, wear was reduced by 70 percent with 15-micron filtration".
Most of engine damage (by a wide margin) occurs with particles below 10 microns. A 99% at 20 microns would remove the vast number of particles in the 10 micron range. A 40 micron filter would not. I don't ever intend to keep another vehicle beyond 80 K miles but ultimately these vehicles will go to grandchildren. So I am all in on this type of filter. Seems like a no brainer??
Thinking about it more....eventually most cars use more oil with age. My Subaru with 195K miles on it now gets a diet of 40wt oil. Consumption is around 4000 miles per quart with it. Compared to 2000 miles. In high speed on 30 wt oil it used a quart every 300 miles. That no longer occurs.
I thought like that at one time. Fram Ultra is one of probably a few filters I know of that clearly states you filter 20 microns@ 99%.
and
https://www.machinerylubrication.com/Read/30697/choose-oil-filter
"Typical automotive oil filters remove particles 40 microns and larger."
"AC Delco Division of General Motors tested diesel engines and found an eight-fold improvement in wear rates and engine life with lower lube oil contaminant levels. In a related study on both diesel and automotive engines, General Motors reported that "compared to a 40-micron filter, engine wear was reduced by 50 percent with 30-micron filtration. Likewise, wear was reduced by 70 percent with 15-micron filtration".
![[Linked Image] [Linked Image]](https://media.noria.com/sites/Uploads/2018/1/24/f7dfffee-3048-450d-8a12-f1072f9c10c5_GM-study-engine-wear_extra_large.jpeg)
Most of engine damage (by a wide margin) occurs with particles below 10 microns. A 99% at 20 microns would remove the vast number of particles in the 10 micron range. A 40 micron filter would not. I don't ever intend to keep another vehicle beyond 80 K miles but ultimately these vehicles will go to grandchildren. So I am all in on this type of filter. Seems like a no brainer??