There was some really useful info here such as the the viscosity of the Aero Oil and a review of the viscosities and grades. Sorry the guy with the 43,000 posts doesn't like your image of the viscometer.
No, there's a long history of BLS posting goldn book and incorret "facts" on lubricants...planks skitting over ball bearings of "uniform molecule size referring to viscosity as the "time flow" charateristic of lubricatants...
And bringing nonsensical statements and inferences....seriosuly, the 10W40 oil developed for Rotax engines will protect the gearbox ?
of what ? your turboprop ?
Rotax oil isn't going anywhere NEAR that compartment.
Base oil and additives are more inportant in a lubricant sense than viscosity ?
Then the image states that it's the most important parameter ?
That stems back to his defending the use of M1 0W30 in the mixed compartments of motorcycles, and defenfding that to the hilt in spite of JAMA recommendations...
"Golden Book", unreaslistic oversimplifications don't help others learn REAL information.