Yes - I will follow the narrow (synthetic) path ; )

~GOD BLESS~

john

I've always run Amsoil 5W30 diesel engine oil in my 6.5 diesels. I also use a bypass filter - either Amsoil or FS2500 - and run extended oil changes.
I change the oil every 20,000 miles.

I install a T in the engine oil cooler return line to supply the bypass filter and return to the fill neck.
I bought a bunch of 5W40 Mobile 1 when it was on sale cheap. I am only going to run that 10,000 miles and test it as Mobile does not recommend running their oil for extended oil changes.
After I run out of the Mobile I will go back to Amsoil

bypass filter...
 

I would love to know more about your bypass set up. Do you remove from the block the existing filter mount and then install the T fitting into that and run the lines as you suggetsed?

Is it available in a kit somewhere with alll the parts included?

I would love to have the extra oil capacity and extra filtration from that type of set up.

Thank you for your input!

~GOD BLESS~

john

I leave the OEM filter alone.

I install a T into the return line from the engine oil cooler. It's easiest to do when you are changing the engine oil cooler lines anyway.

I have mounted the bypass filters a few different ways. On the 1994 there was plenty of room to mount on the drivers side fender well behind the battery. On one I mounted the filter to the right side of the drivers side battery box. On the 98 Suburban I mounted the filter horizontally on the inner fender by the anti-lock brake controller. I made it so the whole thing could be taken out to change the filter

I weld a nipple in the engine oil fil;l neck to attach the return line

Most excellent...
 

I was trying to figure out how you did it - now it makes sense. I will look around and scope out for some good mounting places and then put the extra filters down as a future project.

Thank you!

~GOD BLESS~

john

You have a 1996. I'll try to remember to get pictures of how I mounted the bypass, the T and the return.

If I do not get back to you, message me and remind me.

Diesel oil will be black the second you start the engine. Changing it sooner won't change the color. Just so your aware

You are right... the oil will be black...
 

Especially since some hangs around in the cooler lines etc... I was just thinking about changing it at a decent interval so I could take a sample and run an oil analysis. I went , in my opinion, too long on the last change.

Thank you!

~GOD BLESS~

john

I use Rotella 15w-40. I use a larger capacity filter (Purolator, I believe the L40048). It's the NAPA 1794 crossover to Purolator. Now my system holds 8 quarts of oil. This oil filter cannot be used on 4wd applications.

With the bypass filters you will notice a lightening in color of the oil about 500 miles after you change it.