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Bob;
It's not a no-no "for cars of this vintage" by any means...as far as I'm concerned, it's the BEST THING in my opinion (and Walrus's, last time the subect came up, but I'll let him chime in with his own comments and experience)...besides, how does a hydraulic fluid know, or care what vintage of vehicle it's in?...in the first place, the only thing it's in contact with is metal and seals, so the ONLY issue which is critical with respect to particular vintage vehicle is seal compatibility, and in order to receive a DOT rating one would presume the DOT did the exhaustive research necessary to pass hydraulic, thermal, deterioration and compatibility requirements...not that I give the US DOT blind faith...after all, they still haven't seen fit to standardize bumper heights for ALL vehicles in the US, and it wasn't until into the 80' that they finally approved lighting other than the sealed beam junk, and they are the same bureaucratic brainiacs which assigned the completely illogical and downright deceiving 5.1 designation to non DOT5 compatible glcol based fluid (DO NOT MIX THE TWO)!...not exactly shining examples of our tax$ at work...
I have done my own compatibility studies with Girling seals and have satisfied myself that no excessive swelling or deterioration of the Girling seals occurs (besides do you know of ANYTHING better for rubber and synthetics than silicon?...Armour-All et all is making millions on that!)...further, I have better than DECADES of nothing but excellent first-hand experience on a number of vehicles (122, 1800, 1800ES, 140) and systems (brake and cluth hydraulic). Nothing bad to report yet...NOTHING!...clutch masters are still full after a year of being parked, and cluth and brake rebuild times more than quadruple!...show me that with LMA!!
...but don't take my word for it!...make up your own mind...I periodically search on the subject to see if there's anything new and enlightening out there...here is my compilation of the most interesting items which I found up to now in my research, complete with more of my insightful thoughts and (WA) comments: http://www.intelab.com/swem/Amazoning%20with%20Silicon%20Brake%20Fluid.htm ....enjoy!
Cheers
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