<VV> ZDDP in Accel Oil

[Bryan Blackwell]

Hi Ken,

PPM stand for 'parts per million', that's how much Zinc or Phosphorus is in the oil.  SL oil specified 1000 PPM of ZDDP (a compound that contains Zinc and Phosphorus), so there is some logic behind using that as an acceptable amount for flat tappet engines.  I don't know how much ZDDP is in the oil you're using or in the additive, so I can't help you there, sorry.  Personally I use oil with those levels, there are still a few available, my current choice is Mobil 1 15W-50, although their 0W-40 looks reasonable too so I may try that in the 110 that's going into the '65.  Hope that helps.

--Bryan

On Mar 6, 2011, at 6:06 PM, Ken Clark wrote:

> Not being familiar with the 1000 ppm in the ZDDP, I would like some explanation please.  I have the ZDDP in my oil. I,ve added 4 oz of Lucas zddp and not sure if that's adequate.   The 16 oz container says to add it all to engine when changing oil then run for 1000 miles and change oil again presumably without adding more ZDDP.  I need a good answer as to what is enough of this stuff.  There's been a lot of talk abot the ZDDP, but not to the amounts needed that I've seen.  Thanks , Ken Clark