I kinda like what this guy says. I would ove to see a UOA from his engine.
quote: OMG that's horrible. Although I haven't changed the oil in the new civic for 12,000 so far, got another 13,000 to go before it's changed. But the filter will be changed every 7,500. Synthetics are great.
I rebuild motors pretty often and to find a motor like that is more the norm than not. I'd say about 90% of the ones I pull apart are gunked up like that. I honestly believe the average Joe never changes their oil. I'm doing up a 4.3 V6 now for a buddy of mine and the nasty tar stuff was like a jelly mold under the valve covers. It's so nasty! I assume the oil was so dirty that it became abrasive, it had to go .060 over to clean the bores up and the timing chain was so loose I could almost remove it with out pulling the gears.
Course, when I cut my teeth on engine work, back in the mid eighties, even a 3-4k oil change engine was pretty gunked up. I was pleasantly suprised when I pulled the valvecovers on the Impala and found everything to have only a light coat of varnish on everything. Course, it has had 2 ARx treatments and a steady diet of LC...