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Gravely 2-wheeler
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I have/use 8 trimmers/chainsaws/blower that use 2 cycle mix. I have been using a 50:1 mix of ethanol free premium and Pro-Mix Premium Synthetic Blend 2 cycle oil in everything for years. Some of the equipment manuals specify a 40:1 mix. Am I doing any long term harm using 50:1 in everything? Most equipment is 1970's - 1990's with one new trimmer (50:1 spec).
 

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not quins. but sextuplets
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15,241 Posts
I have/use 8 trimmers/chainsaws/blower that use 2 cycle mix. I have been using a 50:1 mix of ethanol free premium and Pro-Mix Premium Synthetic Blend 2 cycle oil in everything for years. Some of the equipment manuals specify a 40:1 mix. Am I doing any long term harm using 50:1 in everything? Most equipment is 1970's - 1990's with one new trimmer (50:1 spec).
if the specs call for 50/1.. use that

if the specs call for 40/1.. use that

don't put 50/1 in a saw that calls for 40/1

u can get buy if u put 40/1 in a saw that calls for 50/1
 

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Moderator
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5,115 Posts
If you are using 50:1 in something calling for 40:1 you are not providing enough lubrication and yes it will eventually cause problems. There are reasons that manufacturers indicate a specific fuel mix. And conversely using 40:1 in a tool requiring 50:1 is providing too much oil and can cause fouled plugs
 

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Money Pit
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I am no expert but back in my dirt bike racing days we would run full syn 40 to 1 in all our 32 to 1 bikes and never had lubrication issues, engine failure is a different story. I've heard that the 50 to 1 syn oil can be run in place of up to 32 to 1 in todays 2 strokes. Truth I don't know, facts I don't know. I would just say better to be safe than sorry.
 

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There are sooooooo many threads regarding the mix ratios as well as the oil types. Dino versus synthetic. 32:1, 40:1, 50:1, etc. From a non professional standpoint I will make this observation. Most modern oils, whether synthetic or dino, probably do a better job of lubrication than oils of yesteryear. Heck I am old enough to remembering mixing regular motor oil in the old Buttercup Lawnboy at 16:1. With all that being said, I have run 32:1 in every piece of 2 cycle equipment I have ever owned or currently owned using Lawnboy oil. Just my preference, but I have never had an engine failure and rarely have excessive plug fouling and/or port clogging. My opinion, as far as engines that run at a high RPM such as chainsaws or string trimmers, is that they should probably not be run at a lighter mix than what the manufacturer recommends. Again, just my opinion. A Lawnboy mower running at 3200 RPM is no where close to a chain saw or string trimmer RPM. For me, I will stick with what has worked for me for over 40 years. Bill
 

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Modern 2 cycle oils can be run at 50-1 in anything. Modern equipment can be run at 40-1. Go over to Arboristsite and read a few of the endless oil debates about oil brands and ratios. I have about 10 old saws, trimmers and newer blowers, I run everything on 3 1/2oz Lucas simi synthetic oil- 1oz Seafoam-gallon of 87oct with ethonal. After 48 years of of owning 2 strokes, that's where I've end up.
Cannon
 

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I start with a base mix for all my small engines(1gal premium plus 5-6 oz diesel)Some of that is mixed with dino 2t ,50:1 for modern 2 strokes and 32:1 for old 2 strokes.
 
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