No one that is in the no thinks the design is sound. It's not. However, oil can make problems worse for certain.
Stihl 4-Mix Oil?
- Thread starter SteveSr
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Chris1044
ArboristSite Member
Right, but this thread was/is headed in the same direction as all oil threads which basically say oil/ratios can make or break an engine. The reality is the "testing" which was done to make that claim has far too many variables and lacks controls to be able to make a blanket statement like that.
The original post asked about stihl ultra and newer FD formulations. I'm a single data point and am saying I've exclusively used HP ultra at 50:1 with 87 octane ethanol enriched gas for 10+ years and not had a problem. This is with a br600, an fs90, and an MS290 beater saw which I know isn't 4 mix. Factory jets, approx 1k elevation.
Is it the fact that I let my machines warm up before hammering them? Is it that I let them idle for a few before shutting them down to cool the valves off? Is it that I keep the valves adjusted regularly? IDK.
But my point is that I personally believe if you use HP ultra, mix it to 50:1, and use the equipment with some care and common sense you won't have an issue.
I agree with you that statistical validity is almost always thrown out the window in these threads.
In a 4mix oil ratio really isn't an issue because the piston temps are low. It's more of an issue in 2 stroke chainsaws.
I absolutely would not buy a 4mix, but if I did I would use Ultra to be honest. In a two stroke I would never use it.
Another thing lost on these forums are oil types are application specific. You would not run a motor oil ment for use in a aviation piston engine in your car for good reason. So why would you use a oil formulated for a 4mix or a boat in a chainsaw?
Chris1044
ArboristSite Member
100% agree except for buying a 4mix.
In my case my ms290 drinks it more frequently then it should because I don't really care about it. Rather lousy saw...and its mainly limbing use anyhow.
My 4 mix units haven't been bad for me. But they're commercial grade, older, and don't see commercial use. For what I've paid and the use I've gotten, I'd buy them again.
That is all I have ever used in my 4 mix. No issues.
I had a fs130 and ran either motomix from stihl or redarmor. 50:1. Always the pre mixed stuff. In the several years I had and ran it, I had zero issues. The reason I switched to redarmor is the stihl motomix stunk.
To chime in again, I used my KM91 all season on Red Armor. No issues to report.
Well, there is running and then there is running.
Some of these commercial guys run these things several hours a day every day from Memorial Day until Labor Day and more.
Blowing the leaves out of your yard or trimming your yard or a few limbs is meaningless.
I have a couple that I got for free just needing the crud build up cleaned off the valves, seats, and stems.
And, I know where there are a couple more, I'm just not in the mood.
When you have ten men working on 40 acre industrial plant landscapes it is not your yard, or your weekend warrior stuff.
Some of these commercial guys run these things several hours a day every day from Memorial Day until Labor Day and more.
Blowing the leaves out of your yard or trimming your yard or a few limbs is meaningless.
I have a couple that I got for free just needing the crud build up cleaned off the valves, seats, and stems.
And, I know where there are a couple more, I'm just not in the mood.
When you have ten men working on 40 acre industrial plant landscapes it is not your yard, or your weekend warrior stuff.
Exactly.
KG441c
Keith
Theres the anwser. I have a BR600 sitting in my shop that needs interal cleaning that Im not even planning on fooling with but instead I bought a Husky 570 and hadnt missed a beat in 4 yrs now
Redmax/Husky is the way to go for big back pack blowers. Echo's are good too.
