Cummins ISX oil leak at startup

My 2013 ISM has the same issue front cover is a piece of tin with a thin rubber edge i had it changed by a really good local mechanic and it leaked a month later FOR $2,OOO. I also noticed that if I let her sit for awhile all the seals dry out and more leaks show up but after driving it a day or two they swell back up and slow down or stop! They're oldies but goodies, keep an eye on it and add oil as needed.

 

If it leaked as bad as mine. Truck washes were pretty regularly as it covered my fuel tanks and the frame and everything else.

 

Depends on the leak. A puddle to me is a good size leak.

 

Think I'd swing by Cummins and ask exactly where it's leaking.

 

I have a 2014 that I bought recently, had oil all around the bottom part of the engine. I pressured washed it good and started it up. I only found one leak which was the gasket to where the fuel pump mounts on. Seems it’s a common problem. Your probably looking at 4-6 hour job to replace. Once that was fixed, no more leaks. My engine had similar miles to yours.

 

If it only leaked on start up I wouldn’t worry about it. I had issues with front cover on my ISX but got it fixed. I ran mobile delvac and had a small leak on the passenger side of the pan. I switched to Mystik JT8 15/50 full syn and the leak has stopped. Probably because if thicker oil, I’m about to send my second analysis out on this oil. If it looks good, I’ll continue using! It’s only $270 for a change with filter and labor.

We used this stuff in rig motors, and pump motors in the oilfield that got completely abused. Idling hours through the roof and running WOT for days on end.