I have repaired two DL 50's of the Marymoor club members and sold the parts to another so he could do the repairs himself. All three gentlemen were using the same anemic fuel/oil mixture. If you put some quality oil in your gas and mix it to the engine manufacturers recommendations, which is not 80-100:1, your engine will last you a long, long time. I have a first generation DL 50 with about 40 gallons through it in 2-1/2 years of hard flying. It's just like the energizer bunny and strong as a mule.

Jody