Engine Rebuild Cost

[hpmaster]

All oil additives are detrimental to engine life. This is not an opinion. If there are things you think you're lacking in your oil, then get a better oil. Don't dump in a $5 bottle of crud and think that you're outsmarting professional Tribologists and billions of dollars of research.Now, Top Fuel engines are an entirely different story, but that is about the only exception I can think of.

Some 15 years ago I asked my friend, Dave Smith, who has since retired, who was high up in Goodwrench Racing about what the GM engineers stance on MotorKote was. His reply was after testing GM would not confirm that it did or did not work as advertised but that it did zero damage to components in their opinion. This combined with my own experience with oil analysis testing I would assert you paint with a rather broad brush.JMHO

[Bubstr]

Take it for what it's worth, but quite some time ago, the EPA set limits on Zink in motor oil. GM came out with their own oil supplement called EOS, engine oil supplement. The only reason was to add that zink back in.

Recently VW has recommended oils with higher zink content to keep warranty up.

We where having trouble with flat tappet cams with aggressive ramp speed and the EOS seemed to cure that problem. Before that, I would have said oil supplements was a bunch of bunk also. You could actually see the improvement on the camshaft and lifter finish after break in with a magnifying glass.

I'd like to say it helped wear and temps in the quick change also, but I installed a good filter on the hand pump at the same time. The way I see it is, a little cutting oil on a drill or mill will change the finish for the better and reduce heat, so why not.

[Necrosis]

You guys all make a great argument...FOR BUYING A BETTER OIL!!! Not dumping in a bottle of gunk. Btw, zinc (zddp) is one extremely small part of an oil's additive package. You ever hear people say that old Rotella T was the best because of it's high zinc level? Well guess what, the NEW Rotella has higher zinc content.When you add random crap to your oil, you change a carefully balanced formula. Unless you are extremely knowledgable in Tribology and blending, you are 99.9% of the time doing more harm than good.