And this is my point. You can't take common automotive methodology from 50+ years ago and say it still applies today, but a lot of people seem to think so. Yes, in the 60's these impurities were simply dumped into the atmosphere. Obviously, that is NOT a preferable method these days. That's why automotive engineers redesigned our engines to deal with these impurities. And chemical engineers have redesigned our fuels and lubricants to help this issue (among others).
Oil caked intake valves cause knocking and pre-ignition. The PCM retards the timing to protect the engine. This is why you lose some power.
And that would be quite possible on a GDI engine but...as we've pointed out, our engines are not GDI. So...the chances of having intake valves caked with carbon (not oil) are highly unlikely.
This is what I emptied out of mine this morning after only a little over 2000 KMS. No sign of water, just ugly oil. I’d say about 2.5 ounces worth.
It's not just oil. Smell it. It's really a mixture of oil, gasoline, water and acids. That's why it's a bad idea to burn it.
