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The m915 series trucks have the firewall mounted luberfiner. The puradyn is less than 1 micron and adds additives when the oil goes thru it.

Blackstone labs in Ft Wayne Indiana is like $20. They will send you a kit. https://www.blackstone-labs.com/?session-id=dynabs2nnrdefb55i5q1pi55&timeout=20&bslauth&urlbase=https%3A%2F%2Fwww.blackstonelabs.net%2FBstone%2F%28S%28dynabs2nnrdefb55i5q1pi55%29%29%2F I used a puradyn pft24 system...

Just an update as I have always ran Rotella 1540 just basic stuff. I ran the T6 synthetic for a bit and my engine didn't like it. She got loud. No surprise. I just did a recent oil change and went over to Delo 400 SDE cause it was on sale for $10 a Costco. I know this stuff is fairly new only...

Leave the old wire in its place and simply just run a new one thru the firewall hole up and over the steering column and into the dash Sent from my SM-G935P using Tapatalk

They will loan you one. Gauges are always iffy. Sure way is to swap it all to a manual gauge for about 75$ ; Sent from my SM-G860P using Tapatalk

Rule of thumb on any military truck. Never trust your gauges. If you think its suspicious take 5 mins and screw a pressure tester into it and vary them against the readings. You can also solder a ground wire directly to the sending unit and establish a good frame ground. Also try to clean the...

Send your oil in for analysis before you change it to see what life is left. Or add a bypass oil filter system that will get out smaller contaminants. I have them for sale. Sent from my SM-G860P using Tapatalk

If you want cleaner oil that will last longer then upgrade to a bypass oil filter system. The filter unit has a less than 1 micron rating which can captures everything. Most bacteria are 3 micron in size. It will slowly clean all the contaminants out. Also gives you a 25,000 to 40,000 mile oil...