Normally I am flying my engines on 14% oil, at least until today without any problem. OS FS-52 was run most of the time on 10% oil without any problem. Of coarse longevity is an issue.

Anyhow I didn't mean to open an oil % fuel discussion because there is another thread for this.

All I wanted to underline is the superiority of OS compared to clones like Magnum, ASP and SC in terms of metalurgy and operation.

Keep in mind that apart from OS and Saito I do have a Magnum (4-stroke 120) but I do know that it is of inferior quality.

You always get what you pay in this world!

Stelios