I use wynns diesel gold now and then because it does no harm and it made a miraculous improvement to a clapped out old transit i had once , the thing had been run on poor quality biodiesel for years and a bottle of that produced a huge belch of black smoke followed by a new lease on life .
I've used the Liqui Moly stuff and can't in all honesty say I noticed any difference. If the engine isn't performing or running well due to choked injectors or whatever then these potions may be beneficial but on a sweet running motor, is it really worth it? As Shayne said though it won't do any harm.
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