ORIGINAL: tkg
I have seen just one wore out gasser. It was a Q 35 and it had about 20 years on it. It had finally wore through the chrome liner, bearings and seals were OK. The oil of choice for the flier was " what was on sale". So who knows what went through it.
I have seen the results of a 1000 hr run (24-7)on a Sachs 4.2 based engine. Using dino oil at 40:1 only thing out of specs for NEW parts were the rings. Look like they would go 2-300 more hours before needing replacement.
To be truthfull about it any MODERN 2c oil will let an engine run its full rated lifetime. The wrong oil mix, carb adjustment or lack of proper cooling is what kills most new engines
I don't recognize the brand Sachs, is it suppose to be commercial with 2 rings? For commercial, 1500 hrs is not the longest, for regular home owner engine, it is very good!!! How is deposit on the piston and ring/s? Deposit below the ring?(bad)!!
The Q 35, 20 years, how many hours? How's deposit? That already sounds very good!!!!
I agree, I think having oil and not running too lean is the most important, everything else is secondary. I just play it safe and use the cheapest JASO FD oil. I got Echo at Home Depot for $4.99 per 16oz.