By-Pass Oil Filtration - Hogwarts Magic or It's Just For Muggles?

[OggyOggy]

Searched this forum and came up squat. So...

2012 6.7CTD with 68,000 miles. Oil change religiously at 5k. I've just recently run across talk of something called a by-pass oil filter. Very simple install but is it worth the effort? Decided to come here to get the gospel.

 

[DavidC]

Some say there is no need as there are Cummins engines with a million plus miles on them and still running. That said I have had a Oilguard bypass on mine for the last 60k miles and I do not go crazy extended oil changes. I change the engine filter around 5-7.5k and add makeup oil then change everything by 15k.

Dave

 

[lpennock]

With normal oil change interval nothing to be gained IMO. With extend oil changes there could be something to be gained.

Think of it this way. Say I have a contamination maximum goal of 100 and each times the oil goes through the motor you add 5 contaminates. After 20 pass you would reach your goal. Now if you filter 2 contaminates out each pass you only add 3 per pass so it now would take 33 passes to reach your 100 contaminates. So you can extend the interval before you reach max contamination.

The other argument is the bypass is taking out contaminates that are too small for the regular filter but as you can see above that really isn't true as only a portion of the oil is bypassed into the finer filter.

So IMO it is snake oil.