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I have the same two Fairview regulators on my 3402RL but have not experienced this problem. Every other RV I have owned with the Auto switchover valve the tanks were both connected directly to it as you say yours were in the past.
The switchover is a 2 stage regulator, so reduces the pressure from the tank to the desired level, I have no idea what the rationale was for the small red regulator since it only affects on tank. If I have a problem with it I will remove it altogether.
When I have experienced oil residue in lines or regulators it has always been colored, not clear and did have an odor. Are you sure that was not water which may have frozen and affected the regulator, too much moisture in the tank on that side perhaps. I would think in a small regulator like that any 2 tbls of liquid would affect the diaphram's operation, that may be the problem.
Will be interesting to see if it will work correctly now the regulator has been drained. Good luck.
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