Guys! I see comments here on cams wearing out because of the lack of Sulphur in the oil.
This is so true & its an easy fix.
Use a single viscosity oil for Four-Stroke Diesel engines.
These still have the much higher Sulphur content to lubricate.
Have a look at what Dave Hughes @ Hughes Engines in his Tech: column has to say about it.
He is spot-on!