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Hi:
I just researched all of this. The 5606 is a mineral based fluid. 5606 is a 1940's mineral based fluid that is being replaced by a newer retrocompatible fluid. The new spec is 83282. The best way to go is Shell Fluid 31. this is synthetic based product that is compatible with 5606. It has a much higher flame temperature.
I sent a new sample of fluid 31 for oil analysis with particle count. It certainly meets the spec of "super clean." I also sampled the existing 5606 fluid. The lab found the 5606 fluid that was in the system to be contaminated and the particle count was high. I'm flushing Fluid 31 through the whole system.
Dave
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