[Healeys] ZDDP - shorter version ...

[Robert Blair]

Slimmer text ..... the 3K rule

The catalytic degredation by Phosphorous is real, and so the downward
trends of ZDDP levels is justified for newer engines with newer design
tolerances and metalurgy, plus huge cats.

So for us older folks with older engines we must maintain 'adequate'
levels of zinc - metal surfaces are not as tolerant/smooth and the
tolerances/gaps are designed to be larger.  Adding to the problem is
that weighs have dropped to match the smaller tolerances - typically
5W30 for a modern engine - adding to the tolerance/gap problem of older
engines.

My take - keep the weight up, make sure there is 'enough' on board
ZDDP, or add 'enough' ZDDP to a modern cat saving oil, change often.
Robert.


                       
  Robert N. Blair
  65 Yellow BJ8
  rnbmail at yahoo.com

   
  















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