I found other than thickening the oil or cleaning the passages, those additives are almost all the same. Lucas, STP, Generic, they all are temp fixes at best. I would say the most long term solution would be to clean the good ones and replace the bad ones. I am looking at about $135 from advance auto to replace mine. I would replace the ones in the Montero, but thats getting a gen3 3.8 anyways.
-------------------- Richard E
1989 Montero - SR coils, SR steering box, 31" Wide track Baja
1989 V6 Auto Raider - SR Rear, LSD Front, Superwinch Hubs, 33" BFG Mud terrain KM2
1987 Mitsubishi Starion 2.6turbo Start of my tuner addiction
1983 Honda XL600R
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