Just a few things to note ...
Lots of Porsche engines are aircooled ... the 358 is basically a beefed up VW with better heads.
Well used engines often make TBO where under used ones often don't. This isn't so much to do with engine handling as it is to do with internal corrosion. A well run, well used engine will outlive a well used or little used but well run one. Make sense? Well heat will cause the breakdown of oil and cause certain acids to be released ... this is bad. Lack of use alows any water vapour to remain within the engine ... this is bad, also certain parts such as cam followers, pushrods ect are held tight to other parts in one position for extended periods ... this is bad. Poorly run engines suffer more wear by misuse than well run ones ... this is bad. However, accept in catastrophic circumstances this may not be as bad as a a little used engine that isn't properly inhibited or at least run regularly.
Hopefully that makes sense?
Any more contentious myths? ... or none myths?
IM