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It may not even be related to the oil choice.
If a bearing starts wearing and throwing lead into the oil, that bearing probably isn't going to heal itself. My guess is that lead will continue to increase no matter what oil is used. Higher viscosity may help to reduce lead iniitially, but it will probably continue to increase and eventually (probably not tomorrow) that bearing is going to be bad enough that the engine will need to be rebuilt.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check Here
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