I never saw a pix of there valve cover or valves to see the carbon or varnish. Plus I never stated it (varnish) is a problem but you WILL have more with dino; It is a FACT here. It is the nature of cheap dino oil. Not going into it but do somehome work on oils and then post back. It is not apples to apples.
So that is 1 person with 320K miles...and that means? What is the car history, location, driving habbits, fluid, person driving (age) etc????? Showing a screen capture means ZERO.
Feel free to take this offline of on bob is the oil guy. I will be more then happy to talk about it.
Boy I'd like to be a fly on the wall for that conversation! :whistles: ;)