Suitable oil for 912 ULS year 2016...

I use Mobil1 10W40 4T Racing Motorcycle Oil in my Rotax 912ULS.  more than 800TT with zero problems.  This oil is 100% synthetic...

Where did you hear Aeroshell factory burned down. I haven't heard a word about this. I just bought three cases of Aeroshell Sport Plus 4 and you can't find any info on it on line?

He's probably referring to this shortage of AeroShell grease products, caused by this massive fire in 2021, which is unrelated to supplies of AeroShell Sport Plus 4 oil.

That's what I use 4T full synthetic.  but be careful not to use full synthetic if you are using 100LL or a mix there of.

Mobile One Racing 4T full synthetic is a good oil to use with auto fuel, but if using 100LL then you need to use a semi-synthetic like Aero Shell Sport Plus 4. We need to use a motorcycle oil because of its additives like ZDDP.

Zinc dialkyldithiophosphates :The main application of ZDDPs are as anti-wear additives in lubricants including greases, hydraulic oils, and motor oils. ZDDPs also act as corrosion inhibitors and antioxidants. Concentrations in lubricants range from 600 ppm for modern, energy-conserving low-viscosity oils to 2000 ppm in some racing oils.