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Problem is it is a risk in changing fuels so best is to stick with what you use until you strip it and clean/rebuild. This go for changes in fuels as well as change of oil in it. Each combo has its properties...

The few that don't run Alkylate makes my parts suppliers happier. It is a rare occasion a saw with alkylate has fuel issues. I don't have any pro customers that run on pump gas anymore. A few farmers/semipro's and some home owners. Q8 2-stroke Alkylate cost 19SKr/liter, Aspen 2-stroke costs...

Mostly about operating saw, handling, service filing etc.. But I give advice on anything that can benefit the saw or handling of it.

RPM in log is still around 10 000rpm so a lower top rpm is not of any matter unless it is a limbing saw. Work rpm change when ported and sometimes if muffler is modded too, but these saws don't make their life of rpm like some others.

I service some saws for a couple arborists, they don't run them much in comparison to most loggers I have here as customers, this is true.. Looking at the run time on a saw it is no debate at all. The worst beat up saws is from the beech loggers. If you get them to value the advice they get...

No. I doubt you need that, but not sure what muffler and carbs you get in US. Here we don't need it, it performs well without mod. If you need more power, you get a bigger saw. When I sell a saw I update it if needed, service it and start it up, run it half a tank in wood, look it over tighten...

They leave me with less work/money. I am small enough to don't care, but it is a huge difference in number of saws you need to sell to get full time service. As I service any brand I see quite a bit. But as a brand it is just as the others, they have their good and bad saws. Trick is to know...

It it helps there has been a bunch of 357's, 361's and many others that rattled apart. It say's very little a bout a brand or a model. So do 5 series HVA...

Brand of saw has less to do with it. A good dealer is priceless. We had good Dolmar dealer here since 60's so you find quite a bit happy loggers running them around his place.

I doubt anyone notice any difference in performance between 7900 and 7910. I haven't so far... But I go by saws performance rather than manuals texts... About them falling apart... That is just BS. Example! I have two now that are out daily cutting oversize wood in a job that demanded one 576...