If  thinks that two wrongs always must make a right, he has the right to do so. But it takes all credibility out of Wikipedia to keep use incorrect sources only because they in turn copy the same mistake over and over and over and over. The system with Swedish military designations are not exclusive to aircraft or engines and have been the same since long before there were aircraft. This goes back to at least the 19th century, probably more. This is something I became aware of long time ago after spending hours digging in archives doing researches for numerous books and magazine articles about Swedish aviation history over the years. Why do you think it's SK 60 and not SK60 in the aricle(or even worse the Americanized SK-60)? The designation system is the same for Army bases, Air Force bases, Navy bases, radar, cameras, robots, airplanes, vehicles, guns, actually anything that goes into an inventory list including engines both piston and jets! Military systems anywhere are not exactly known for being flexible. Everything should be conformed the same. It should be the same with Wikipedia. If we want to spell the engine designation incorrect, then the airplane designation has to be changed to the incorrect "SK60" as well! This goes for all other SAAB aircraft articles in all languages on Wikipedia! It has to be either, we can't have both! Personally I think it's easier to change a few incorrect spellings than hundreds that are already correct! After all, this is about common sense!! 

Also remember that a commercial website is often made by a webmaster who doesn't really know anything about the subject. This is not only true about Volvo Aero's web, but also the Swedish Armed Forces website who also have some similar misspellings. Sometimes they get it right though! (i.e. misspellings are not consistent on their web!) And yeah, even sorces like Jane's sometimes get it wrong!

"Infallible"? I'm not even gonna go that low to answer such a obtuse comment. Although it do say a lot about BillCJ himself!