Posted by LJD on April 14, 2012 at 10:52:55 from (75.213.191.64):
In Reply to: 2 cycle gas-oil mix posted by Mike (WA) on April 14, 2012 at 06:27:49:
I'm wondering what book you have that states 16 to 1? I worked for Stihl dealers back to the 60s and probably have every version owner's and tech manual Sthil ever printed for the 030 and 031 - along with all the other post-WWII saws. All state a 25 to 1 ratio if using SAE 30W motor oil or 40 to 1 ratio if using "special" Stihl two-stroke-cycle oil.
The newer richer mixes (less oil/more gas) have nothing to do with making your saw run better or last longer. It's all about emissions. So, newer saws have to be built with better materials to sustain less lube ratio. More oil in the gas still gives better protection for any saw. If it calls for 50 to 1, it will get better protection with 30-1 and even better yet with 20-1. It's not arguable as I see it. Many tests have proved it. More oil equals less metal wear. I run 20 - 1 in everything. This way I've got one mix that fits every two-stroke-cycle engine I own regardless if built in 1950 or 2012. The ONLY downside to using more oil is - you might have to open up the main jet a bit due to a leaner mixture and a spark arrestor screen might plug up faster. Stihl does not make any of their own "special" oils. I tend to use Ammsoil Dominator synthetic because it's specifically rated for air-coolded HD use and it's easy to find in quart or gallon bottles. I'm sure there are plenty of other good oils but I refuse to buy those rip-off little bottle. The prepacked premix is even more of a joke. Two-stroke-oil, unlike engine oil, is rarely tested and certified to meet specs. So, to a large degree, you have to be trusting in certain brand names and "in-house" testing.
I've run 20-1 in many of my older-then-40 years Stihls, along with my new Dolmars, Efcos, and Echos. NO problems and I see it as good insurance.
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