Andrew sorry to say buddy, using Fuchs was not the reason for the failure, to even suggest one oil change could blow the engine is laughable.
The motor had major concerns b4 Winton, that's why Archie left Calder so early, the thing was pinging off its head. Archie also knew the internals were questionable and was warned (and agreed) on how long the engine would last. Why do you think he was soooo calm at Winton, after the blew it?
I have been using Fuchs for the last 3-4years and have never had any issues at any, track/fun day/drag/cruise/etc. I truly believe that this oil is just as good as the Castrol oil, but at the end of the day ppl make a judgement on what they know.
Not having a go at you, Andrew, just stating that there are alot of contributing factors in this car's particular life and that no matter what oil was used it would have ended in the same unfortunate way.