A real US made McCulloch made into the 1980s (and not a later Asian saw) calls for a 20 to 1 mix with SAE 30W motor oil or 40 to 1 with air-cooled rated two-stroke-cycle oil.. Early Jonsereds circa. 1960s used 10 to 1 with SAE 50 motor oil. Later Jonsereds used 40 t0 1 with air-cooled rated two-stroke-cycle oil.
Just about any saw will do fine with that sort of mixing. I've got two dozen saws I use and all get 25 to mix with air-cooled rated two-stroke-cycle oil. I've been doing that for 50 years now and never burnt up an engine yet. That includes several new saws that call for 50 to 1. My 25 to 1 mix works just fine and it's cheap insurance. The reason for the low-ratio modern mixes is the EPA and has nothing to do with engine longevity. It has been proven over and over that even new engines last a bit longer with heavier mixes. Newer saws are built with more durable materials then many older saws because of the low oil mixes.
What Buick-Deere stated is almost 100% true. Yes, heavy mixes plug up spark arrestors (if you have them). Eventually they all plug anyway. Easy to clean or remove. And yes - more oil to a mix makes a saw run leaner since carburetors work by volume. More oil means less gas per cc. No problem as long as you can adjust the carb and open up the main jet a bit. The benefit of a heavier mix is it allows for mix-mistakes, allows use in older engines that call for 16 to 1 mix, and will help any engine - new or old last longer.
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