2-Cycle Oil mixed in Fuel?

[Luis]

I was reading a thread in another site. (Just lookin') They were saying its OK to use 16oz of 2Cycle Oil in every other tank of fuel. They say it helps keep the system lubricated (especially the pump) and may prolong injector life. Any thoughts???

[DmaxMaverick]

Sound logic, IMO. I've been using 8 oz. in every tank for years. Don't know why they would suggest every other tank, though. If it's beneficial, the benefit should be used every time.

[Luis]

Thanks DMAX...that's good to know...I don't know why they say every other tank...could their suggestion be so the fuel doesn't get too saturated with oil? My question now would be; will the oil separate and settle to the bottom of the tank if it sits too long? Would too much oil hurt the fuel filter.

[DmaxMaverick]

Realistically, you could run straight 2 cycle oil. You may have some injector fouling issues after a long while, but it would run.

No, it will not "settle out" of the fuel. Once it's mixed, it will remain indefinitely mixed. There may be some point in time where some of it's properties my separate, but probably not in my lifetime....and it ain't gonna sit for years to allow that to happen.

2 cycle oil has some very desirable properties. Fuel stabilization (long term storage, helps keep fuel molecules bound together instead of separating and souring, like gas does), lubrication, and viscosity improvers (helps the fuel flow through very small orifices). The oil is designed to be used in small(er) engines, which generally run at significantly higher combustion temps, which may add some heat handling qualities, such as valve burnishing. And, it's designed to burn, which means there should be a minimal amount of fouling anywhere in the combustion path.

I use the cheapest stuff Walmart has by the gallon. It's the TWC rated oil, which is designed for water cooled engines. The non-TWC oil is designed to burn in higher temp air cooled engines, and may have undesirable characteristics in your much cooler running Diesel. Not scientific by any means, but it makes sense to me.

[TheJDMan]

I have been running 2 cycle oil at a rate of 1/2oz per gallon since ULSD was introduced. Adds just a bit more lubrication for the injector pump and nozzles. I use 2 cycle oil in the truck and tractors.

Try this, next time you fuel your truck leave it running at the pump, put in 12-16oz of 2cycle oil and then fill the tank. By the time you are finished fueling you will likely be able to tell the engine is quieter.

[Luis]

Thanks everyone...I did add the oil this morning...I poured in 16oz of the PENNZOIL Multi-Purpose 2-Cycle Oil then filled up with 17 gal of fuel. (Did not leave it running) It's rating is NMMA TC-W3, TC-W II and TC-W. I'm assuming this is the same...Why not synthetic 2-cycle oil. I use 2-Cycle AmsOil in my saw, weed-whacker etc. And everything runs great; and i use them a lot!

[richp]

Hi,

Is this OK to do with the LMM and DPF?

I was under the impression that it would speed up the clogging of the filter medium, so I stopped doing it when I got my new truck.

Rich Phillips

[JohnnyR]

It won't plug the catalytic converter over time?

[Mark Rinker]

>>>2 cycle oil has some very desirable properties. Fuel stabilization (long term storage, helps keep fuel molecules bound together instead of separating and souring, like gas does), lubrication, and viscosity improvers (helps the fuel flow through very small orifices). >>>

To this point, I mixed 5 gallons of regular unleaded gasoline at a 40:1 with Mercruiser 2 cycle oil in our old family boat. (1967 Glaspar 16' with 65hp Merc outboard - built by Larson of Little Falls, MN) Our weekend plans changed, put the boat away inside in a farm shed...

...seven years went by!!!

To my horror, I discovered that I had failed to even unhook the fuel line and drain the carbs, as had been standard practice since 1967, when the boat was new. Put in a new battery, turned the key. ZOOM. Started and ran on all four cylinders, with a moderate amount of smoking. Added enough fresh fuel and oil mix to top off the tank, and went boating...

2-cycle oil stabilizes gasoline - no doubt about it.

[More Power]

Hi,

Is this OK to do with the LMM and DPF?

I was under the impression that it would speed up the clogging of the filter medium, so I stopped doing it when I got my new truck.

Rich Phillips

As has been mentioned here, 2-cycle oil will add lubricity to the fuel, but...

Through the years, 2-cycle oil has been used with some success as a diesel fuel lubricity additive. After all, this type of oil was engineered to provide lubrication in dilute concentrations and to burn during the combustion process. However, other than a potential to increase emissions, its use doesn’t contribute much to the combustion process. In an older non exhaust-catalyst equipped diesel pickup, 2-cycle oil might contribute to fuel lubricity without much of a downside, but there are better choices. No matter what, don’t use 2-cycle oil in a 2007+ emissions certified and Diesel Particulate Filter (DPF) equipped diesel engine.

For a fuel additive to be useful, it must be available at the larger retail outlets and fuel stations. If you buy your choice of commercial diesel fuel additive in a 5 gallon container, a 1:1000 fuel treatment cost could be as low as 2.5 cents per gallon of diesel fuel. This low cost eliminates ATF, motor oil, or 2-cycle oil as a contender when used solely or primarily as a fuel lubricity additive. In addition to a lubricity improver, most commercial diesel fuel treatments contain a cetane improver, which may increase fuel economy enough to offset the cost of treatment. 2-cycle oil won't, by itself, improve fuel economy.

Jim

[lmholmes11]

Can you run both 2-cycle and a fuel additive? (I use FPPF)

[Inspector]

I do it and it does make the engine quieter. Check out the fluids and additives forum.
Denny