Greg,


Altitude does reduce the effective compression ratio.

Although OS break-in instructions have been known to be incorrect at times; contradicted by their own Q&A and people, I would say their nitro recommendation must be adhered to.

They would only gain by recommending more nitro, if it was safe for this engine.

I don't think Cool Power a sufficient percentage of oil either... 17%, where 18 is OS' minimum number.