Hey jack111,

I think your SC might have problem with that lube because its too thin for Campro. Modern engines should be able to use thin lubes because they have much smaller manufacturing tolerance compared to the 90's, but honestly I would think its too thin for our engines. 30's have lower ability to withstand shearing at high temperature, and you know Campro is pretty hot after you run it for a while, plus our hot climate. However, if you still insist on using it and the SC says some crap about it, you can show your Persona manual pg. 123, "Selection of engine oil" and the only two requirements are API SJ and SAE 20w-50.

Every SC has the tendency to treat you like they know more than you, but I would recommend our fellow forummers to build good relationship with your SC, if you want to get things done. If you think you've got a point, give them a smile and tell them why you think some things should be done in different way .

Proton has done good work in consolidating their vendors, and the next step moving forward would be to work on their after sales service, provide "customer service 101" to those sitting at the counters and provide incentives to keep the more experienced mechanics from running away from Proton SC.