The 912 is a very conventional, plain bearing, horizontally-opposed four stroke engine with a pushrod operated valve train and a modest redline. The gearbox and slipper clutch make it resemble a motorcycle engine is some ways and Rotax used to recommend quality motorcycle oils.
Now we are told that the 912 is more likely to make TBO when operated with only one oil. Before that oil was recommended, we were told it would make TBO with any one of several oils. In fact, before the current restriction to just one oil, we were told, over and over, that the 912 so very often ran well past TBO. How were 912s so reliably making TBO without the one oil now recommended?
In the previous post, we are told "There is even a little talk coming down about a possible issue with Mobile One 4T". What does that mean? Why say it? What issue?
What is a "high wear" engine? How do 912 engines fail when approaching TBO? Is it the main or rod bearings that fail? The cam followers? Valve guides? The rings? If not these parts, then why is the oil an issue at all?
I am tired of all the 912 folklore and speculation. Why did Rotax change to only recommending Aeroshell Sport Plus 4? Are other high quality four stroke motorcycle engine oils (that were previously recommended) really inferior in that engine? How about showing us some data rather than the steady supply of rumor and speculation ("There is even a little talk" - what is this, a Hollywood tabloid?). It makes me very tired of Rotax and its "insiders" with special knowledge and I own a 912 (my second).