Prior to S/N 812, the MLG "Lipped" seals were of natural rubber, and required a vegatable oil fluid, such as brake fluid. After s/n 812, the seals were "o" rings and used petroleum "red" hydraulic fluid...and also the brake system now utilizes red hydraulic fluid.
Worn cylinders can be refitted with the older seals, and work very well, I am told; but I think that the vegatable oil based fluids then have to be used. Perhaps some new seals are compatable with petroleum based fluids. Harry
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