112. While bunkering heavy fuel, what quick/easy test can one perform onboard to determine the compatibility of 'old' with 'new' fuel?

Take equal samples of both fuels, elevate their temperature, and mix them vigorously. If no frothing occurs, they are compatible.
Perform a running viscosity test of both fuels, at the same temperature, if the viscosities are equal, they should be compatible.
Mix two equal samples of the two fuels at elevated temperatures and determine if they become a homogeneous mixture.
Use blotter paper with a single concentric drop of 'old' and 'new' fuel, if they do not form separate circles, the fuels may be deemed compatible.

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