In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Tracy Allen wrote:

When thinking about low temperature issues, I talked with John Barrowman at Parallax about how to evaluate the crystal or resonator choices.   He suggested looking at the crystal output with an oscilloscope, using a low capacitance 10x probe.  The output should be a strong sine wave, just less than rail to rail.   If it clips with flat tops, then turn the oscillator setting down a notch.   If it is less than full, then push it up a notch.   A few pf of extra capacitance can make a difference too, but the value of the external feedback resistor is not seem to matter much, except to establish DC bias.

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