today i went to wallmart and bought some 134D cost me $ 43.00-5 gal for the rearend & transmission i sure hope she mixes with the 80/90 i have in there allready. the old girl was taking for ever to warm up enough to raise the back blade- i put in 1 3/4 qt of 134
 
You have something else wrong.My 640 has 90 wt in it and lifts cold with no trouble.I had 134 in the hydraulic system, no lift power in warm weather.
 

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