That Wynn's stuff improved my 80's steering a lot , i need to do a few hundred miles before i'm convinced the leaking has stopped completely but if it has i will just change the fluid and call it fixed .
I put similar stuff in the engine oil too because why wait for a leak when seal conditioner might prevent it altogether . If i can find it for diffs and gearbox that'll get chucked in to , the only thing i won't use is coolant leak stop .
I will be taking the truck out for its first decent run under my ownership tomorrow so the tanks full with Wynns diesel gold fuel system and injector cleaner added , and there's a can of EGR cleaner spray waiting to be used before i set off .