Marvel Mystery Oil

[SH]

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?

[Fast_Mopar]

mowermech wrote:

rhagfo wrote:
Better yet use the top rated fuel additive for diesel.
Opti-Lube

that website gives links to the MSDS for the various products.
that stuff is DANGEROUS!
Various types of benzene, naptha, and a couple of carcinogens.
No, thanks!

It's all relative. Gasoline is hazardous when inhaled or ingested. Depending on who you believe, food that contains smoke flavoring is hazardous (polycyclic aromatic hydrocarbons).

[Bamaman11]

SH wrote:
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?

Whenever a diesel suddenly stalls or starts acting crazy when running, the fuel injection pressure regulator may need to be replaced. The part for a Duramax is $308 at RockAuto.com, and it's a 10 minute replacement.

I would never put 2 stroke oil into a diesel, as it's essentially non-detergent 20 weight oil. The preferred fuel additive for diesels is Kleen, and it's available at all auto parts stores. It's a cleaner and cetane booster.

I have no idea how effective Marvel Mystery Oil is in diesels. I've never heard anything bad about it in gas tanks and oil pans, however. I think I'd stick with Kleen for diesels.

[mowermech]

rhagfo wrote:
Better yet use the top rated fuel additive for diesel.
Opti-Lube

that website gives links to the MSDS for the various products.
that stuff is DANGEROUS!
Various types of benzene, naptha, and a couple of carcinogens.
No, thanks!

[mowermech]

It looks like MMO is mostly "fine white mineral oil" with a little benzene and petroleum distillates.

http://www.msds365.com/?free-msds-download=marvel-mystery-oil

When in doubt, google the MSDS for the product you are wondering about, then decide if you want THAT running through your engine!
good luck.

[maxwell11]

I had a valve sticking in my old jeep a few years ago,

an older fellow at napa told me to try 1 qt. of MMO: 1/2 in the fuel tank and 1/2 in the crankcase.

he said, if that does not loosen up the sticky valve, then pull the head.

within a minute of run time after adding the MMO the valve freed up and that was 3 years ago, still running good.
I add the MMO at every oil change.

that said: I would not add MMO to the fuel tank on my dodge diesel.
I have used diesel kleen and opti-lube, both keep the truck running great. opti-lube is a bit pricy as I have to order and pay shipping.

[Fast_Mopar]

I have used Marvel Mystery Oil a lot in past years on very old and very well-worn vehicles with reasonable success. However, due to the complexities of modern diesel truck engines, I would not even consider it.

[Bedlam]

Biodiesel definitely quieted down my 2005 Powerstroke. When I didn't fill with B5, I would add a cetane booster to the tank but it was never as quiet as with the biofuels.

[JustLabs]

rhagfo wrote:
Better yet use the top rated fuel additive for diesel.
Opti-Lube

Just run B5. Its all the lubrication you'll ever need.

[Garry_Gayle]

I tried Marvel Mystery Oil as lube for my Chainsaw Chain, it was a lousy lubricant for that sure as heck would not let it anywhere my truck. Spend the money on a quality fuel additive, like Schaeffer's Diesel Treat 2000, read the technical data sheet to see what it's supposed to do.

[2003silverado]

If your 2007 was the classic you could get away with dumping "home remedies" in the tank. However I see your truck is the 2007.5 with the lmm motor, and as gmc6000 pointed out you need to be much more careful with a dpf equipped truck. Opti-lube would be my vote as well.

[rhagfo]

Better yet use the top rated fuel additive for diesel.
Opti-Lube

[Paul_Clancy]

Try power service or stanadyne. Something dpf compatible

[gmc6000]

When I had my 05 duramax, I always added a quart of 2 stroke oil on every fill up. Truck ran much smoother and was more quiet. Never had any issues. I would not, however, use it on the newer diesels with the DPF.

[Tankcar]

Hi. Be careful of what may of may come out of the tail pipe.