Running modern 50:1 mix in an old 20:1 saw

Plasmech · Feb 15, 2009

This probably sounds like a stupid question, but what would happen if I ran a synthetic 50:1 oil in 100 octane gas in a 30 year old saw that called for 20:1 in the manual? Will it immediately burn up? What has enabled that ratio to go up and up throughout the years anyway? Thanks.

(CS-351VL)

computeruser · Feb 15, 2009

That would be fine. Oil quality has improved so profoundly since the days of 16:1 using 30wt motor oil that wouldn't really "mix" with the fuel...

Lakeside53 · Feb 15, 2009

Didn't we have this arguement 3 days ago?

2000ssm6 · Feb 15, 2009

Why 100 octane?

2000ssm6 · Feb 15, 2009

Lakeside53 said:
Didn't we have this arguement 3 days ago?

Who, what, where??? :dizzy:

Gologit · Feb 15, 2009

Lakeside53 said:
Didn't we have this arguement 3 days ago?

Yeah we did. But you gotta remember....it's Plasmech. He' so far out there by himself he has his own zip code.

blsnelling · Feb 15, 2009

My Contra has 100LL with Klotz R50 @ 40:1. That's what I run in all of my saws. I only have the 100LL in it for storability since it won't see much use.

Plasmech · Feb 15, 2009

computeruser said:
That would be fine. Oil quality has improved so profoundly since the days of 16:1 using 30wt motor oil that wouldn't really "mix" with the fuel...

That's what I suspected but wanted to make sure. Maybe someday we'll run 100:1.

Of course by then, lithium ion batteries will be so good that we won't need piston engines

Plasmech · Feb 15, 2009

blsnelling said:
My Contra has 100LL with Klotz R50 @ 40:1. That's what I run in all of my saws. I only have the 100LL in it for storability since it won't see much use.

How long does 100LL last? Heard it smells real nice too.

weimedog · Feb 15, 2009

I've run 32:1 in all my two strokes. Motorcycles and Chainsaws alike. With the better synthetics that mix burns clean enough not to gew up the exaust. I used Mobil One MX-2T and when that source dried up I went back to Bel-Ray HR1

chugbug · Feb 16, 2009

I'd never run a 50-1 in a 20-1 saw !!! But thats me , why take the chance of burning it up , I run 32-1 in my old homelites and 50-1 in the new saws .Hey all your going to do with a rich mixture is maybe foul the plug !!

J.W Younger · Feb 16, 2009

oil lowers the octane of gas?

DEG305 · Feb 16, 2009

CHUGBUG; Where are you located in "north east" Pa? I live in Equinunk, Pa. Just north of Honesdale.

maico490 · Feb 16, 2009

Where's Gary?

BlueRider · Feb 16, 2009

I've been running 50:1 in an old 051 that I use for milling. I've ben doing this since 1994 and have milled thousands of BF and the saw is running as strong as ever. last year when I converted my back up 051 into an 075 I had both my saws torn down and they looked great.

Brian S · Feb 16, 2009

Everything I have runs on 50:1 Stihl Ultra. The old Mac's run fantastic on it.

Running modern 50:1 mix in an old 20:1 saw

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