Stihl 2 Stroke Oil Fuel Mix: Diesel Fuel Lubrication Engine Additives  -- Tractor Maintenance Discussion Forum and Review Stihl 2 Stroke Oil Fuel Mix: Diesel Fuel Lubrication Engine Additives -- Tractor Maintenance Discussion Forum

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Discussion Boards > Active Subjects > Messages as Posted > Diesel Fuel Lubrication Engine Additives Forum

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 11-02-2003, 11:58 Post: 67810
Chief



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 Stihl 2 Stroke Oil Fuel Mix

I recently used up my last bottle of Stihl 2 stroke mix last week (which I purchased in bulk a few years ago) and purchased more a few weeks ago to replace it. I mixed up the new Stihl 2 stroke mix and noticed it is blue in color but went on about my business. I accidently spilt some on my hand and noticed that it was NOT near as oily feeling as the old stuff I was using. I am sure I mixed it as per the directions on the bottle but just did not trust how thin the fuel looked with respect to oil content. I doubled the mixture to 25:1 to be on the safe side expecting to see alot of smoke and mess but it burned very clean. I think I liked the old formula better. Has anyone noticed this? I am very hesitant to chance burning up a $400 leaf blower or my $900 Stihl O-66 with fuel that may be EPA friendly but not sufficiently lubricating the engine. I will email Stihl and post whatever response I get from them.






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 11-02-2003, 12:10 Post: 67811
AC5ZO

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 Stihl 2 Stroke Oil Fuel Mix

I have been burning two stroke oil in various machines for decades and I always mix the product according to the oil manufacturers directions.

I have had two engine seizures. One was on an engine that was running oil injection rather than premix. The other seizure was when I rode a friends motorcycle at an altitude about 2500 ft below the altitude it was jetted for. The first problem was cured by increasing the injection volume. The second problem was a simple jetting issue that was uncovered when I rode the bike more agressively than its owner.

I have never seized or had a problem with any of my chainsaws, weed whackers, or other 2 stroke engines running the oil as recommended by the manufacturer. Excess oil tends to burn hotter, foul plugs, and gum up the works, so adding too much oil is not good. Today, I run mostly synthetic oils at about 50:1.






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 11-02-2003, 12:16 Post: 67812
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 Stihl 2 Stroke Oil Fuel Mix

They might have changed the mix formula with the new 4 strokes out.






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 11-02-2003, 12:32 Post: 67816
DennisCTB

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 Stihl 2 Stroke Oil Fuel Mix

I have a new model Stihl Chainsaw, an 8 year old Red Max Leaf Blower, and a 16 year old Tanaka weed wacker. The older equipment all had mix ratio recommendations under 50-1.

A year or so ago I used the Stihl 50-1 mix in the 16 year old Tanaka and it seized up. I changed the mix ratio to 38-1 (makes roughly 2 gallons instead of 2.5 as recommended) and the Tanaka and the rest of my 2cycle stuff is working fine with that mix. I think 25-1 is probably pushing it too far the other way.






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 11-02-2003, 13:04 Post: 67819
Billy

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 Stihl 2 Stroke Oil Fuel Mix

Chief, The 2 cycle oil makers are going to a smokeless formula. If it calls for 50:1, that's the way I'd mix it.






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 11-02-2003, 19:35 Post: 67851
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 Stihl 2 Stroke Oil Fuel Mix

I have older saws that will not wear out. Even though I heated my house with wood for years. The saws are 61cc engines with chrome cylinders, needle bearings, and a compression release. The saws (when new) called for a 16:1 mix. I have always used that mix using quicksilver outboard motor oil. What mix would you use in the saws now?
Bud






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 11-02-2003, 19:52 Post: 67855
AC5ZO

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 Stihl 2 Stroke Oil Fuel Mix

My chainsaw is fairly old. My father bought it and used it for years, so it is at least 20 years old. I am sure that when it was new, it used a conventional two stroke oil with a fairly concentrated mixture. We did not go from 16:1 to 50:1 without changes in the oil. If you are using a conventional oil, and it works for you, it makes sense to use the mixture that works.

Those conventional oils caused us problems with our unlimited desert racing bikes in the late 70s and 80s, so a lot of the racers switch over to the newer and fairly expensive synthetics along with the leaner oil mixtures. I don't know of a single racing team that has gone the other direction. The engines run cooler and stay cleaner.

I have taken the synthetics to my other equipment like the old chainsaw, too. It may be more critical here. I live at 5300 ft above sea level. Oil and fuel mixtures are critical, more difficult to adjust, and are less forgiving.






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 11-03-2003, 06:53 Post: 67872
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 Stihl 2 Stroke Oil Fuel Mix

I wonder if some manufacturers have backed off 50:1 recommendations. That may be true in the case of our Township Wajax forestry fire pumps but I'm not certain the company ever recommended 50:1. Discussion came up in the context of 'Don't use your own chain-saw fuel in the pumps.' I seem to recall somebody saying that newer engines don't use 50:1 any more. Fire pumps would be a different application from most. They are expected to go under heavy loads for many hours at a time.






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 11-03-2003, 12:26 Post: 67898
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 Stihl 2 Stroke Oil Fuel Mix

Here is the email reply I got back from Stihl today on this issue. I was very impressed that they replied so quickly. I disagree with the recommendation at least until I can get some hard facts and figures as to how well this new oil works. I'm not going to risk a $900 chainsaw on one email just yet. I will run the oil mixture as rich as will run clean until then.



"Randy,

We are in receipt of and thank you for the e-mail. The Stihl oil produced
today we feel is better than the oil produced in the past. We recommend
mixing the oil at a 50:1 ratio. Mixing the oil at a 25:1 is not
recommended. Using the 25:1 ratio can lead to excessive carbon deposits and
insufficient cooling.

Thank you again for the e-mail.

Sincerely,

Kris Williams
Technical Advisor
Stihl Inc."






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 11-03-2003, 13:06 Post: 67900
Murf

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 Stihl 2 Stroke Oil Fuel Mix

Randy, we have MANY hours on older equipment, Stihl and others, using that new oil, no problems yet.

We also noticed the lack of smoke, kind of nice but I still think of two stroke smoke as visible indication of the protection.

Best of luck.






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Discussion Boards > Active Subjects > Messages as Posted > Diesel Fuel Lubrication Engine Additives Forum

Thread 67810 Filter by Poster:
AC5ZO 7 | ackley280 1 | Art White 3 | Billy 2 | bmanke 1 | budgie 1 | Chief 7 | DennisCTB 3 | DRankin 4 | GaleHawkins 1 | JAZAK5 2 | kwschumm 1 | Murf 3 | TomG 4 | WillieH 2 |




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