My take on the Dino vs synth is... It can be discussed for ever cause there are way too many variables in engine design , year , model, load , rpm , usage, condition etc from all the different posters who offer a contribution to this issue, You cant compare a newer common rail electronic fuel management Diesel with 2 oil pumps, high pressure piston jets, large oil coolers, multi oil by pas systems and a centrifuge to a older low tech good ole trust worthy ford 120 found in so many trawlers, Perkins 6.354s also, If you own a new design engine then synth has value but in my opinion if ya got a old school ford or Perkins its far better to change out Dino more often like every 100 hrs max with a filter change every 50hrs, The cost is not that more than purchasing synth and trying to go for 200hrs between services my not pan out, I think you all should save your bucks on synth oil and apply the savings to clean fuel cause that's what causes all the carbon problems to begin with, but that's just my opinion