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jdcaples
09-26-2011, 06:19 PM
Folks that are interested in getting the longest life out of their vehicles sometimes gather on forums (like this one) as well as forums like "Bob Is The Oil Guy (http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=cfrm)" (aka BITOG).

It was reading BITOG a lot when I first got my Sprinter. I was fixated on the bypass filter section, esp for motor oil and for transmission fluid. Piper1 - and his used oil analysis postings - pretty much convinced me that a bypass filter for DPF equipped Sprinters is a losing effort. The transmission, on other hand...... well, read on.

At 18,000 11,000 miles, I dropped my transmission pan, changed the filter and noticed the same muddy paste on the transmission pan magnet that sikwan noticed at a tad over 20,000 miles on his 2006 wagon.



Sikwan's thread:
http://sprinter-source.com/forum/showthread.php?t=2557

Sikwan's post showing the black, muddy paste:
http://sprinter-source.com/forum/showpost.php?p=18993&postcount=2

Sikwan's picture:

37534

.... and again, back when I only had 18,000 miles on my Sprinter, my transmission pan magnet (again) looked the same as sikwan's.

A few months later when the weather was nicer and I had a friend modify a spare transmission pan for me, I installed a bypass filter on my transmission fluid circuit. This was at 21,000 miles on my Sprinter.

Now, 20,000 miles later (with 41,000 miles on my Sprinter, my transmission pan magnet looks like this:

37535

Forum member rlent did the same thing. Here's a posting:

http://sprinter-source.com/forum/showpost.php?p=52769&postcount=21

Why did I install a bypass filter on my transmission fluid circuit? To avoid this:

http://sprinter-source.com/forum/showthread.php?t=2476

Why am I posting this in Sprinter talk and not in a Write-Up area?

Because this isn't a write up, it's more of a discussion opportunity.

Why is it not posted in NCV3 Talk?
Because it's not just NCV3s that may benefit (or die an early death) from a bypass filter.

What do you think? Is it good? Is it bad? Is there not enough information to draw a conclusion?

One more thing, I did ask Andy Bittenbinder. My question and his answer are both here:
http://sprinter-source.com/forum/showpost.php?p=18512&postcount=14

-Jon

PS: try not to resurrect old threads... let's talk in Sprinter Talk about this in this thread :)

gary 32
09-26-2011, 09:28 PM
I was planning on 4 years or 40k miles for a trans fluid and filter change, none of those fluid/filter images you referred to look dirty or overheated. I always ask myself what problem do I need to solve and I just don't see one.

Might be time for a little rehab Jon.

jdcaples
09-27-2011, 12:05 AM
The problem: Didn't want to drop the valve body and clean the solenoids because of that black, muddy gunk.

BBlessing
09-27-2011, 03:05 AM
I was planning on 4 years or 40k miles for a trans fluid and filter change, none of those fluid/filter images you referred to look dirty or overheated. I always ask myself what problem do I need to solve and I just don't see one.

Might be time for a little rehab Jon.

hi my name is jon, and i am a sprinteroholic... :lol:

seriously though jon, what are the details on your added filter? looks like i should consider dropping the pan on my rig.

bb

sikwan
09-27-2011, 05:14 AM
Which would be a better benefit? Install a second filter or change your fluid more often? If you have the secondary filter, do you change it and not change the fluid since it's still clean?

For me the $ amount is the deciding factor, but I don't know how to determine the mileage change interval.

jdcaples
09-27-2011, 03:12 PM
Change interval: I haven't decided on that yet.

The prescribed duty cycle of transmission fluid is 60,000 miles or 6 years.

I thought that was a bit long given the amount of gritty debris I found at 10,000 miles and 20,000 miles.

As I looked at the magnet and the lack of material on it after 20,000 miles with the bypass filter deployed; I'm more comfortable with the 60k cycle....


The filtration medium is Scott 1000 sheet, single ply toilet paper. Changing the bypass toilet paper means adding about (I think) a quart 1/2 of transmission fluid, so there's the on going cost.




Bruce:

The bypass filter unit is the same that rlent used, a modified Motorguard MG30.

http://sprinter-source.com/forum/showpost.php?p=34747&postcount=65

My roll didn't look as dark after 20k as rlent's look after nearly 60k:

http://sprinter-source.com/forum/showpost.php?p=45267&postcount=156

rlent went way further than my ambition would take me.

My design's pretty simple.

37555

Oh, how do you know the bypass filter's not working? The housing doesn't get hot.
Why can't it over heat? The bypass filter is not in line. The fluid has a natural tendency to flow towards the cooler. Only some fluid gets sent to the bypass filter at any given moment.

-Jon

PS: this is a simplied version of dialysis for patients with end stage renal disease.... you don't shove all the patient's blood through the filter before you give it back, you just divert the blood flow - a little bit - filter the blood, and put it back in the patient.