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Of course you’re right. It’s PCV gunk. The fuel that gets into the oil evaporates at running temperature and delivers PEA to the back of the intake valves! Geniuses I tell you!

The Pennzoil Ultra Platinum 5W30 tends towards the low side of the viscosity index so you shouldn’t notice any mileage penalty. I think it will be fine year round in So Cal. I’m running it in my F150 I would run a bottle of RedLine or Techron Heavy Duty injector cleaner since dirty injectors...

Valve overlap. How does fresh filtered air form deposits on intake valves? It doesn’t. Combustion byproducts are leaving the deposits.