Walker Air Sep Filters on 44DB

bbwhitejr

Well-Known Member
Apr 14, 2013
4,300
Lake Lanier GA
Boat Info
2003 420DA, 6CTAs
Engines
NA
I will have to check for sure, but I am supposed to have the blue Walker Air Sep filters and I have a couple of questions.

1) What is the difference between the blue and red?
2) What is the difference between the read and blue oil?
3) Can the red K&N oil be used on the blue filter?

All thoughts welcomed.

Thanks,
Bennett
 
I use the K&N red oil for my air seps all of the time. I keep an extra set so I clean and oil the, and exchange when necessary the clean and oil the other set. I am not aware of the difference between the blue and red filters but I believe the blue is for Cummins and red for CAT. You can buy the blue here or many other online stores. https://walker-airsep-superstore.my...-air-filter-cleaning-kit-red-oil-part-ddf9016
 
I use the K&N red oil for my air seps all of the time. I keep an extra set so I clean and oil the, and exchange when necessary the clean and oil the other set. I am not aware of the difference between the blue and red filters but I believe the blue is for Cummins and red for CAT. You can buy the blue here or many other online stores. https://walker-airsep-superstore.my...-air-filter-cleaning-kit-red-oil-part-ddf9016
I have Cummins. I have red. All my buddies with Cummins have red.
 
The original equipment Walker Air Seps that were supplied with QSC's and those retrofitted to QSM's were all blue. I don't know the difference between the blue and red though.
 
Oh and those on my MAN 900's are blue too.
 
This red blue stuff...just proves its still winter...

But if I had to choose ..I would vote red every time.. :)
 
Last edited:
Brian - I think mine are red!!! I'll look Friday...
They very well may be Carter. I spoke to MAN this morning about this issue. Apparently the dye (blue or red) is added to the oil so that it can be determined that the oil has fully coated the filter element. There is no difference to the oil itself, just a different coloring. As a side note I was a little surprised that MAN actually new the answer as oiling filters isn't necessarily the best use of a $150/hr. mechanic. Since it takes me about two hours to clean and oil my four air filters, the cost of having MAN remove, clean, oil and reinstall my four filters it's not far off the cost of just buying new ones. When I asked him about it he said most owners they deal with give them an open check book for maintenance and they repair (clean and oil) or replace based on their own judgement. Just for the record, I do that maintenance myself.
 
Soooooo, this subject got me thinking so I did some additional investigation. When I checked with PDI in Houston, the supplier in the US for MAN parts, they told me the new filters for my engines, which are $70 each, are pink, HOWEVER, that is the color of the filter media as they are NOT delivered oiled. They recommend using the blue oil so that it is easier to see where the oil has covered and penetrated. And my wife thinks I have too much free time on my hands....
 
And my wife thinks I have too much free time on my hands....

LOL! my "MAN man" looked at mine on my annual service and said they looked fine. I agree with doing them ourselves! At least in FL my "Man man" charges $120 an hour!!
 
That's odd, mine came oiled when purchased from Walker. This was also confirmed by a dock neighbor that called Walker.

I'm sure that's true. Cummins used Walker Air Seps on the QSC and later model QSMs, MAN does not. Not sure who their supplier is, though they look just like the Walker Air Sep filters.
 
I just asked and got a response from a very reputable yard in Gulf Shores, AL. Red are for Cats and blue are for Cummins. The only difference between the two was a possible slight difference in micron size. The red oil and the blue oil are also the same except for the dye in them. His only suggestion was maybe to stay with the correct color of oil so as not to possibly void a warrranty.

Bennett
 

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