It will pay you to run as long as you can, and if/when you shut it down, remove all ash and vacuum the interior of the ash cabinet, grease the rollers on the ash plate, lube the two bolts on the ash rod, clean and lube the ashing chain, and carefully remove the fan assembly(after re-installing the shipping bracket) and clean out the cyclone chamber. I have seen dozens of 130's and 260's all caked up solid and wonder how efficient they were...it is a short job, and I recommend you do it in the middle of the heating season on a warm day also. The rope gasket will need to be replaced probably, but you can KNOW just what kind of shape the coal you are using is doing to your boiler. I you are all done for the season a light oil will help the moisture issues throughout the summer. I have burned year round since 1977, so I'm not a good reference on summer shutdown, except that we replace every exhaust stack that sits over the summer......hint, hint! There is a YouTube video of a guy doing a 260 shutdown and cleaning. Don't freak out about 'toxic anything' and a simple dust mask will be you best friend. A Vac with a HEPA filter is what we always use. A light spray with a spray light oil does wonders even in the short term.
You have an investment to protect and this is not like 'putting a car up on blocks'. It will rust away if you choose to be lazy about it.
ALWAYS consider the tankless gasket replacement if things even look suspicious. 20 dollars is really cheap money!!! Anti-seize the damned bolts too!! Anti-seize everything in sight,,,,JUST DO IT!!! ....even if you are a sterile quarters freak!!!!