Everybody please remember that Boule did the table based off of bumping the entire gallon bottle of Rotella T.

Fl.Oz.    ppm for Redline            ppm if adding ZDDPlus or Eastwood ZDDP Booster

0.000       1200
0.125      1271                                1320
0.250      1290                                1389
0.375      1309                                1458
0.500      1329                                1526
0.625      1348                                1595
0.750      1367                                1663
0.875      1387                                1731
1.000      1406                                1799
1.125      1425                                1867

Making the math approximate and simple, it takes an ounce of Redline Booster to raise the ZDDP in the entire gallon jug by right at 200 points.    That is a half ounce per 100 points.

Since we are now starting 100 points off the old starting point, add approximately a extra half an ounce per gallon makes us right again.   This approximation method gives a ~ check point~ to the table subtraction method for fixing the table.



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I think the easiest and most accurate way to fix the table is to add in the 000 line at the top of the chart as shown and then to subtract 100 points from each of the PPM numbers for Redline and from the PPM for Eastwood.    

This accurately reflects the reduction in the starting point PPM.   And it is an easy to do correction method if it changes again in the future.

This way the top line will reflect the current reality at adding no booster and getting 1100 PPM as the result of adding nothing.   Adding this line keeps us real.  The remainder of the chart as altered would be about as accurate as the original chart.



The result would be this using the subtract 100 from the PPM method:

Fl.Oz.    ppm for Redline            ppm if adding ZDDPlus or Eastwood ZDDP Booster

0.000      1100                                1100
.........      ........                                ........
0.125      1171                                1220
0.250      1190                                1289
0.375      1209                                1358
0.500      1229                                1426
0.625      1248                                1495
0.750      1267                                1563
0.875      1287                                1531
1.000      1306                                1699
1.125      1325                                1767
1.250      1344                                1835
1.375      1363                              
1.500      1383                          
1.625      1402      
1.750      1421                              
1.875      1440                              
2.000      1459                                
2.125      1477                              
2.250      1496                              
2.375      1515                              
2.500      1534      
2.625      1553      
2.750      1571      
2.875      1590      
3.000      1609      
3.125      1627      
3.250      1646      
3.375      1664      
3.500      1683      
3.625      1701      
3.750      1720      
3.875      1738      
4.000      1756
4.125      1774
4.250      1792  
4.375      1810     (going past 1800 is thought to be counter-productive)

Oldfeller--FSO wrote on 11/03/15 at 05:29:15:


add approximately a extra half an ounce per gallon makes us right again

Is that the final answer? Make it easy for an old guy like me.  

Somebody call Shell, and tell them millions of bikers are P'O'd... ...

How fast is zddp used in an average engine?

How fast is zddp used in an average engine?

Not very fast.   Go on Bob's and look at VOA vs UOA results that folks post on the same sump of oil.

Even truckers (who stretch things FAR further than we do) keep right at 1,000 ppm at the end of their oil change intervals.

The US military SELECTIVELY ADD ZDDP to used oil sitting in the crankcase unless it has high silicone or extreme acidity problems or other issues that cannot be fixed.   They do NOT change the oil unless they have to.

The military TESTS each individual machine and decides what to add to the sump.   So do most commercial fleets now-a-days.

I dare say my one year change interval is more than generous as far as keeping silicates down and ZDDP levels up.



Dave will like that my "add a sloppy ounce to a sump" comes out around 1450 ppm, certainly not a grotesquely excessive overcharge of ZDDP by anybody's guesstimation.  

I can make the sloppy ounce be on the short side, you know, if I want to.   I don't measure all that accurately using a Pepto Bismol cup anyway.  I also am a side stand oil window kind of guy, so I use two and a quarter to two and a half quarts of oil.

Dave, if you think the article is correct, truncate the table accordingly.  

Boule wrote it to the highest historical numbers ever used in racing oils, which was 1800 PPM, but oils are better than they used to be and there ARE new things in the oils intended to help things out which do not go away just because we bump the ZDDP numbers some.

If I'm reading the chart correctly then no added ZDDP will get you 1100 ppm with Rotella T. Adding 3/8 oz. (0.375) of Redline booster will extend it to 1200 ppm. Correct?

1 full oz nets you 1306, I think that's a very happy medium between 1250 and 1400
sp .25oz fer quart, since I went and bought some quarts so I'd be able to carry 1 with me in the saddlebag