[TDW]

I used to add the EOS from GM, until I discovered this. It may just be marketing ploy, but it does make sense.

There is no shortage of companies producing a little bottle of “stuff” to be poured in with an oil change. And yes, the additional ZDDP will bring the engine oil composition up to the desired level – but NEVER when it is most needed – at start up.

Spectro “batch blends” their oil. A vat of base oil is heated to 200 degrees, the zinc goes in, the solution is agitated and cooled. Next the solution is heated to 300 degrees, the phosphorus goes in, the solution is again agitated and cooled. Each bottle then receives a number representing the particular batch. Compare this process to “manifold blending” where the zinc and phosphorus are added as the ambient temperature oil flows through the assembly line pipe to the bottling operation.

So, what is the big deal about batch blending vs manifold blending or even pouring in your own after-market bottle of additive? Consider the perspective of a cold engine at start up. The oil is in the bottom of the oil pan, waiting for the oil pump to deliver. Start up creates the most wear on an engine due to the momentary lack of lubrication. Now, with Spectro “cooking” their ZDDP in during the manufacturing process, the additive package gets to the moving parts as quickly as possible. With manifold blending/pour it in yourself, those additives have settled to the very bottom of the oil pan and will not be truly emulsified in solution until the oil heats up. Definitely not an optimal solution!