He is spouting myths that were first propagated 30 years ago when synthetic first became a widely sold product. Its all crap.
Hmm, interesting can you expound on that cause I was more in Master Radio's camp.
(*sorry this next part sounds like an in quesition, not meant to just trying to get to whats real whats not)
Rob, are you saying;
1) Conventional oil wont build up sludge in the engine?
2) Synthetic won't clean out the sludge build up from years of using Conventional oil?
3) Cleaning out the sludge will not reveal any leaks you have?
I think these are the only 3 points the guy makes in the whole video.
Now there is another point I have heard, which is you might also have small leaks that conventional thicker oil is not seeping out of but synthetic might.
Is any of this bad for your engine, no. Could switching to synthetic on an older engine lead to you spending money yes. But its only cause the synthetic is going to expose issues in your engine that the dyno juice hide. Of course the engineer in me then might argue thats one of the advantages of dyno juice, it helps hide engine problems longer.
I think on a turbo with higher temps, running synthetic makes sense. On your old 1960 V8 Caddilac Elderado convertible, I would stick with dyno juice.
This is a VERY much talked about topic in the Corvair world, and I can provide some links to some really good oil testing that might make you rethink brand loyalty. If I were to take what oil I use seriously (If I thought it mattered over my ownership span) for Synth I would go Amsoil, for Dyno juice I would go Brad Penn.