When to worry about engine noises?

QUINN FORBES said

Engine builders recommend using the rotella because it was higher in zinc but apparently they dont use as much zinc anymore. I cant confirm that as it is just what I have been told.
I used it a lot with no guff so far but Im trying the Lucas break in oil on the next build. Like honey! Often wonder about diesel oil being hard on the int shaft for dist and oil pump.

Click to expand...

There is more to engine oil than zinc diakyldithiophosphate.

Choosing an oil based solely on ZDDP concentration is at best an uniformed decision.

At the worst, it’s not doing its job because it can’t.

While I’m on my soap box I might as well go here.

Using a ZDDP additive to “fix” or “upgrade” an oil will pretty much always reduce the effectiveness of the oil.

The guys who formulate and develop these oils are way smarter than the guys who sell these additives.

If your oil needs an additive you need a better oil, not some trick **** in a bottle.