I actually appreciate this. This is something I had in mind, the mechanic not being too sure about the rebuild. I've also noticed most mechanics will just pour any oil not knowing about the rating, viscosity etc. Hay it's oil, will do the job yeah is the line they think along.
He's switched to shell hx7. Will see how it goes. If there is no oil reduction, what's the best oil to switch to? Fully synthetic?