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SH's avatar
SH
Explorer
Mar 05, 2015

Marvel Mystery Oil

Any one ever add this to fuel in your diesel trucks?

The only reason I ask is my 07 Duramax developed a light surging at idle. Researching the issue it is a fairly common problem especially with trucks using low sulphur fuel. The Fuel Pressure Regulator is the culprit. Keep in mind I know nothing about diesel engines but I found a home remedy for this exact (surging) problem. The fix says to drop a quart of two-cycle oil in the fuel tank to help lubricate the regulator.

So I tried it and the problem (surging) immediately went away! Not sure if it is a permanent fix but service center said changing the regulator is a $1000+ job!

I have used Marvel Mystery Oil for years in my motorcycles but never thought about putting in my diesel fuel every so often. I used a regular two-stroke oil this time but would consider the Marvel in the future.

Any thoughts?