The O ring seals do little or nothing about running oil consumption. I just had to install the umbrellas on my fresh 235 to stop the motor from sucking oil past the guides. And the valves and guides are fairly new, only about 12K miles on them. But I have heard of the plastic seals causing oil starvation...

your results may vary.


Preaching the Hot Rod Gospel according to the 4-stroke apostles:

Suck, Squish, Fire and Fumes