Hi all,
I've been reading some of these threads about guys running two stroke oil as an additive with good results. I have been running powerservice, but I want to try something else. How much oil should I run if I fill up at 1/4 tank. Do you think it will be better than powerservice?

Thanks,
*****

 

I run 1 to 2 pints of just the cheap Wal Mart 2 cycle TCW along with a good dose of Power Service. Any would have to help with lubricity. I don't think even a little more would hurt anything as IIRC even Cummins has approved of running up to 5% of waste motor oil. Although I think that much could lead to shorter injector life but hey what do I know ?

 

I tried the same oil (wal-marts) and I liked the quieter engine but there was a lot more soot at the pipe and more smoke as well.
I also felt a loss of performance after a few tanks, but there was also a return fuel line issue developing at this time to so take that with a grain.
Bottom line for me was too much added smoke/soot to run a high concentration. Maybe something like 6 oz's per tank will work better for me.

I don't think its BETTER then Power Service, which adds cetane And lubricity. The two cycle oil adds More lubricity per volume I believe.

Big Jimmy

 

Diesel fuel additives, such as Powerservice and Diesel Kleen, are fine, as they improve cetane rating as well as adding lubricity formula.

As the P7100 Inj Pump is fully lubricated by pressurized crankcase oil, and only pumps fuel, additional lubricants added to the fuel are not necessary when using Powerservice and such.

The Stanadyne rotary distributor IP's, and similar, which use the fuel as the primary lubricant do require increased lubricity additives in the fuel.

Two-stroke motor oils - chainsaw, weedeater, etc - are good for adding lubricity, as they are formulated for combustion chamber service - meaning, they are meant to burn, with no harmful additives.

Motor oils intended for crankcase-only service were not intended to burn, and the additives can be harmful to the IP - o'rings and such - and should not be used as lubricity-improver in the fuel.

Used crankcase oils should never be mixed with fuel because of changes in chemistry from combustion byproducts in blowby, and the various wear-metals picked up in normal useage.
The chemical changes cannot be filtered out by any-size micron filters.

2oz per 20 gallons fuel is a good mix of the two-stroke motor oil to Diesel fuel .

Do not use the 4-stroke outboard motor oil, which is formulated for crankcase-duty.
Do not use automatic transmission fluid, marvel mystery oil, stp, motor honey, etc, in the fuel.

However, stp is a good additive to the crankcase oil, because of the ZDP - a lubricant coating for hi-pressure service, such as the timing gear-train, flat-tappets\lifters, rocker arms and pushrods.
And, the cam\plunger arrangment in the P7100.

ZDP is another useful chemical removed from modern motor oils, as it is harmful to catalytic converters - which were a gasoline-only restriction.

Now that "cat's" are showing up on Diesel-fueled vehicles, ZDP is disappearing from Diesel-service rated motor oils, as well.

 

Ok, so explain to me and a few hundred other people on here why we can't use MMO? I've been using it at every fill-up and no prob so far. It says rite there on the lable it is formulated to use with diesel fuel????????????????????????

 

I don't recall anyone saying you shouldn't use MMO. You just need to figure out how much you are spending for it or two stoke oil compared to how much it costs to run a made for diesel fuel additive.
I think you'll find the diesel fuel additive comes out cheaper and provides more benefits.

 

im curious as to why not to use MMO also.....or crankcase oil. I heard where cummins has that system where it automatically burns crankcase oil on some of the bigger trucks....

 

Good questions, folks.

MMO is (was?) heavy on the detergent, mainly good for scrubbing hi-mileage low-maint hydraulic lifters in gasoline engines - not good for the mechanical Inj Pump.

May be recent MMO re-formulation without - or less - detergent, but Diesel fuel is already a light oil, more and more with less and less lubricity component - two-stroke motor oil is meant for lubricant and combustion chamber duty, and will lube the plungers in the IP.

Again, that added lubricity is very critical to the rotary distributor IP's, where the fuel is also the primary lubricant.

The big rigs that do recycle crankcase oil into the fuel usually have, in addition to the cannister filters, an intricate centrifugal filter, intended to 'wipe' the contaminants from that oil - not the same as just pouring waste oil into the fuel tank.

The process of removing sulfur content from Diesel fuel also results in removing the lubricity components - I would suggest not adding hi-detergent anything, nor hi-contaminant crankcase oil, to the fuel.

BTW - I was attempting to address a question from a mechanical injection owner, for mech inj owners - for you guys with the 2002(?) and up common-rail EFI systems, let Cummins be your guide.

Some components, including detergents, in motor oils for gasoline vehicles are hazardous to electrical components exposed to that oil - your injectors consist of solenoid coils with possible exposure to those components, if not cautious in your choice of 'lubricity' additives

 

I've been adding a quart of TCW-3, 2-stroke for approx 6 months and my truck has never been happier. Less rattle, smoother, and added fuel mileage.

 

MMO is nothing but light oil and stoddard solvent.

Sea Foam is light oil, naphtha and rubbing alchohol.

MikeyB

 

I use approx a quart of wally world 2-stroke per tank. Maybe alittle more smoke, but it cant be much. Havent noticed any power loss. The first couple tanks showed some mpg gains, but by no means were they big gains. I used it for IP lube and to quiet the truck down. My IP is going south so I quit using it and the rattle is back. When I get the new IP I WILL be using 2-stroke and maybe some other kind of cetane boost as well. I might use closer to 1/2 quart per tank. I will never use any kind of motor oil, used or new, in my tank. 2-stroke is meant to lube and then burn, motor oil is meant to lube, NOT BURN! As always, JMO!