I'd be very careful about activ8 and similar additives.
As far as I'm aware activ8 used to be basically chlorinated paraffins, an extreme pressure additive used once upon a time in heavy duty gearboxes (back in the 1930's I think). This works very well in the typical 4-ball test rigs often used to demonstrate the anti-scuff properties (see for example https://www.scribd.com/doc/77921431/Four-Ball-Test ) so the salesmen can make it look like a wonder treatment, but in higher temperature environments typical of engines it can cause serious chemical attack, especially of bronzes but other ma