Originally Posted by BonneMeMN
Frankly IMHO those additives are rubbish. It may climb gears on those little displays at your Local Parts Store, but it causes oil to foam and get air in it.
Some tranny additives are worth it, and fuel injector cleaner is good every now and then. But if your motor oil needed it, it would have it in it already.
This same topic came up on another forum that I am a part of (genvibe.com), and that bob the oil guy is biased to say the least. His testing method seems alright on the surface, but he leaves out a lot of information regarding the parameters of the test. In the pics, he has a couple of gears together and spins them to some unknown speed. At this speed, the Lucas is shown frothing.
First off, I'd be willing to bet that the speed in that test is around 10000 RPM, if not more. The thing to note here is that nothing in our cars (except the */C) spins that fast. Naturally, if you subject something to an enviroment for which it isn't designed, it will fail.
Secondly, Lucas is an ADDITIVE, meaning that you would never run just pure Lucas in your motor and tranny.
The reason that I say stuff about this is that I am a Nuclear Engineer, and I have seen all kinds of lubricants for numerous applications, so I have seen firsthand what happens when you put the wrong type of lubricant into a machine. THis Bob character seems biased at a minimum, if not more, and I think that people should know.
Like I said earlier, I have used both the oil additive (in my old Cobra....which I would routinely run to 7200RPM) and the tranny fluid with great results.
Just my $.50