What is the fuel to oil ratio for a Pro mac 55 chainsaw

SOURCE: Gas Oil Mixture

Fuel Mix: Add 6 oz. McCulloch custom lubricant or 1 PT. S.A.E. 40 (16:1) to 2 U.S. Gal. Regular Gas

SOURCE: Gas, Oil Mix ratio for McCulloch Eager ******

Fuel/Oil Mixture

1. Use a quality 2 cycle oil and mix it to the OIL supplier's recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 8oz/2gal - used for many years) and finally the last 5 (±) years 50:1 (Stihl 2.6oz/1gal)
2. Most gas in the US of A contains ethanol; not good with chainsaws. Mix what you expect to use within a few months. Anything over 6 months old use up in a 4 cycle engine. HTH
   Lou

SOURCE: i have a mac 441 chainsaw i am looking for a

McCulloch International (OMs and IPLs)
http://www.mcculloch.biz/int/

Your OM (441 in window above)
http://www.mcculloch.biz/int/support/owners-manuals/?query=441&types=O
The manual says 40:1 (4 liters of premium fuel to 100 milliliters of quality 2-cycle oil).

IMO Once broken in (3 tanks of petrol mix ±) and the carburetor properly set in it will start easier, take longer to carbon foul and pollute less on 50:1 (4 liters of premium fuel to 80 milliliters of quality 2-cycle oil). Your accuracy of measurement and age of the mix become more of a factor.

If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

SOURCE: I need the gas/oil ratio for an old Pro-mac 10-10S

40:1 according to Mike Acres site, same as current recommended mix:
Chain Saw Collectors Corner
http://www.acresinternet.com/cscc.nsf/ed1d619968136da688256af40002b8f7/8f167f396637c29d88256c2e0073560e?OpenDocument
Oil Mix Ratio:
Dolmar, Echo, Efco, Homelite, Husqvarna, Jonsered, Makita, Oleo-Mac, Red Max, Ryobi, Shindaiwa, Solo, Stihl & Tanaka; all recommend 50:1.
• 1 gallon of premium fuel to 2.6 ounces of quality 2-cycle oil.
• 4 liters of premium fuel to 80 milliliters of quality 2-cycle oil.
McCulloch & Poulan; recommend 40:1.
• 1 gallon of premium fuel to 3.2 ounces of quality 2-cycle oil.
• 4 liters of premium fuel to 100 milliliters of quality 2-cycle oil.
Chinese chainsaws recommend 25:1.

McCulloch Manuals
Operators Manuals: are much more difficult. I have dialed this number many times (Contact Us - All McCulloch Products 1 (800) 521-8559) and have yet to get a satisfactory response. Please try this! If enough of us try they will fix it! If unsuccessful with McCulloch try here:
Beg for manuals thread (ArboristSite - free to join). Please use the search function first, it has probably been asked and answered.
http://www.arboristsite.com/showthread.php?t=72322

If you have more questions or need additional help please reply below and I will get back to you. Good Luck. HTH
Lou
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SOURCE: I have a 18" mcculloch mac 5 evolution Chainsaw

You should run the saw on a 50-1 fuel oil mix, with an oil from a known chainsaw manufacturer and recommended for 50-1, this machine was an Italian built product sold under many different model names, Titanium 460,Partner 538, California, i am sure if you surf the net you will find one. If you cant find one post me your e mail address and i will send you one.