We’ve been asked this quiet a few times of late, so here’s what the Oilman Has to say:
“Generally the answer is no. Most aftermarket oil additives are either useless, harmful or sometimes both. The technology used is often out of date and the products are made incredibly cheaply. If those sorts of additives were any good, the major oil manufacturers would be using them.
The only additives we sometimes advise using are the limited slip differential friction modifiers, for certain differentials.“