Perhaps you would find this usefull:
These two new International designations for two-cycle engines have been
adopted worldwide to classify high temperature air-cooled 2-cycle engine oils.
From Europe the ISO "Global" system, and from Japan the JASO system.
The ISO GC and JASO FC are the most common grades and can be found most
anywhere. I use CITGO "Supergard" air cooled oil on my chain saws (Stihls that
I have had almost twenty years now). It is rated as ISO GD which is the
highest possible 2 cycle rating but can be hard to find. The funny thing is it
never costs any more and often less than other 2 cycle oils. I just picked up
two qts of it at the local Fleet Farm for $1.89/qt.
Finding a decent oil isn't complicated rocket science stuff just buy your oil based on recognized third party oil standards and avoid the hype of manufacturers.
Art
-----------------------------------------------
ISO "Global" System
Global "GD" is internationally recognized as the highest quality air-cooled
2-cycle oil available. It is a synthetic or semi-synthetic, extreme
temperature/anti-scuff/lubricity, low smoke, low ash oil. There is no
comparable JASO or API product.
Global "GC" is equivalent to JASO "FC," Japan's highest quality 2-cycle oil.
In Japan these oils may also be referred to as "Genuine" oils. These oils are
high lubricity/detergent, low smoke, semi-synthetic, low ash oils.
Global "GB" Europe's lowest quality 2-cycle oil, is equivalent to JASO "FB."
It is generally accepted that North America's API TC rated oils are equivalent
to these oils. These oils do not require any synthetic to meet specifications,
but do have detergent and/or lubricity additives, and are typically low to
medium ash oils.
---------------------------------------------
JASO System
JASO "FA" rated oils are used in Pacific Rim countries and are the lowest
rated Japanese 2-cycle oils. They are medium to high ash mineral oils with
limited lubricity or detergency.
JASO "FB" is equivalent to Global "GB." It is generally accepted that North
America's API TC rated oils are equivalent to these oils. These oils do not
require any synthetic to meet specifications, but do have detergent and/or
lubricity additives, and are typically low to medium ash oils.
JASO "FC" is equivalent to Global "GC," Europe's medium quality 2-cycle oil.
In Japan these oils may also be referred to as "Genuine" oils. These oils are
high lubricity/detergent, low smoke, semi-synthetic, low ash oils.
