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what's the difference's between the aq131a -aq131d

Hey there, cant create a post yet so I thought I would respond to this one. I have a Regal Valanti 260 with twin AQ131's. One of them has milky oil, more oil then milk. My mechanis thinks its the oil cooler but I couldnt find one on it and I saw on another site post that they dont have one. Anyone know if this is true?
 
The main difference is the crank they beefed up the big end journals on the 131 c and d. The center main bearing has the thrust washers incorporated with the bearing. Orher than that everything else is the same.
 
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