Old chain saw mix oil specification...

[mole1982]

my c72 calls for 32:1

 

[GASoline71]

You can safely use modern 2 stroke oils in your C72 mixed at 50:1... trust me. It doesn't even need to be synthetic. Just good quality oil.


The manual for the C72 was printed before good quality mix oil was even thunk of.

Gary

 

[mtgrs737]

I use Mobil One 2T synthetic at 32 to 1 in everything, even those that call for 50 to 1. I have no plug fouling, or carbon build up problems and no smoke after warm up. All this on the advise of a long time Stihl dealer and some professional grounds keepers I have known. You will not be unhappy that you had a little too much oil in your mix, but you may be very unhappy that you had too little oil in the mix.

 

[patallen]

one question remain...

does my old homie will perform better with newer oil and leaner mix like suggested ?

it has 5hp originaly.

thanks.

 

[Brushwacker]

Judging from my experiance,your more likely to gain a little power with a heaviar mix,more compression,less friction,less heat, but not so heavy you have carbon problems. I used to run 15 or 16 to 1 in my old Homelites and I would occasionally need to scrape some carbon build up from the exhaust port. The last several years with 25 to 1 I seldom see enough carbon to warrant any carbon removal on my personal saws .
I've had seized saws brought back to life using heaviar oil mixes also.

 

[GASoline71]

The old way of thinking with oil is just ingrained in some of you waaaayyyyyy too deep.

Modern 2 cycle oils mixed at 40:1 or 501:1 will be just fine. My old Homelites see a lot of use on 50:1 Stihl synthetic, and they perform flawlessly... If I was mixing plain old 30wt motor oil, like the old saws used to run... I would prolly still run them at 16:1 or 25:1.

Gary

 

[rbtree]

I use Mobil One 2T synthetic at 32 to 1 in everything, even those that call for 50 to 1. I have no plug fouling, or carbon build up problems and no smoke after warm up. All this on the advise of a long time Stihl dealer and some professional grounds keepers I have known. You will not be unhappy that you had a little too much oil in your mix, but you may be very unhappy that you had too little oil in the mix.

10-4 on that. I run 2T at 36-1.

Rarely hear of any problems from folks who run 50-1.....but prefer the added insurance provided by richer mix ratio. And my saws are mostly all ported, so they are working a bit harder.

However, back when I used dino oil at 40 or 45-1, I switched to 32-1 and did find some minor carbon build-up and occasional plug fouling.....Full syn solved that.

 

[mtgrs737]

10-4 on that. I run 2T at 36-1.

Rarely hear of any problems from folks who run 50-1.....but prefer the added insurance provided by richer mix ratio. And my saws are mostly all ported, so they are working a bit harder.

However, back when I used dino oil at 40 or 45-1, I switched to 32-1 and did find some minor carbon build-up and occasional plug fouling.....Full syn solved that.

I agree, more power with more oil, and cooler running are worth the extra few pennies a tank IMHO. I would never run the ultra high ratios that folks like Amsoil, Opti-2 suggest but that is just me, I believe that more oil than absolutely needed is just good common sense or insurance as you say. In a two-cycle engine oil is just passing through, I say make sure it is getting enough to keep every surface well coated, oil is cheap, engines are not!

 

[pepsifreak28]

2 stroke oil

Well your modern water cooled dirt bike engines run a 32:1 ratio and a 125 cc dirt bike piston isnt much bigger than some of the chainsaws and the shifter kart racers use 32:1 on high rpm ported engines I think my favorite 2 stroke oil is klotz you cant beat the castor oil many of the dirt bike 2 stroke oils have castor oil like honda mix and such if you wanted super good oil I try and stay away from outboard oil though because outboards have water cooling and dont run at high rpms and the oil seams to be thinner IMO