i have a new mark .61 long stroke that i am ready to break in. mark engines run on fai or 0% nitro fuel. the instructions call for 20% castor and 80% methanol fuel for break in. all i have at the moment is omega fai fuel with 17% (30% castor 70% synthetic)oil. i use this all the time in my broken in Moki 2.10 engine. can i add castor oil to this and increase the oil amount enough to start break in? btw, straight synthetic oil voids the warranty. the instructions really prefer castor lubrication at all times. this engine is capable of 17,500 rpms.

thanks, david

You can always add oil to fuel.

that i know but i was concerned about the synthetic oil during break in. i assume i could add in castor oil but what percentages are we talking about? if 20% castor is required for break in and 30% of my current lubrication is castor and 70% is synthetic? and this is fuel with 17% total oil..... i guess i need to break out a calculator or wait until i can order the correct fuel. i have purchased some castor oil, i was wanting to break this in this weekend but i might just wait.

thx, david