On Sun, 10 Nov 2019 11:22:20 -0700, rbowman
wrote:

On 11/10/2019 05:28 AM, Shadow wrote:
I change my spark plugs every 30.000 Km. And they (and the
cylinders) are absolutely clean when I do. The only damage is from the
electrical arc.

Going on 80,000 miles I know there are spark plugs someplace in my
Toyota's engine, but I've never seen them. Changing plugs is so eighties...

I am thinking more 60s 70s. By the 80s we were running unleaded, with
computer controlled fuel injection and had high energy ignitions