Originally Posted by burla
Let's say we wanted to boost an straight additive to an oil formulation, for example moly, how much would 1m-ppm be in ounces? Ot part of ounces?
If you want to calculate what the moly content would be if using a moly addtive like LiquiMoly (LM) MOS2, first you have to know the ppm moly in LM MOS2, which is at
https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1234989 at 4,365 ppm moly.
Now you have an oil that already has 70 ppm moly in it. So you want to know what percent of this LM MOS2 additive you need to boost moly to 200 ppm.....
(x * 4,365) + ((1-x)*70) = 200
Solve for x.
x = (200 - 70 + 70x)/4365
x = (130/4365) + (70/4365)x
x(1-(70/4365)) = 130/4365 (...which later, below, we will show is really close to x = 130/4365 ).....
x = (130/4365)/(1-(70/4365)) = 0.03 or 3%
0.03 times 5 quarts is 0.15 quarts
0.15 quarts times 32 oz/qt = 4.8 oz, or round to
5 oz to get about 200 ppm in the final 5-quart sump.
Easier way, approximate but close enough: Goal is 200 ppm moly in the sump, and your motor oil already has 70 ppm moly to start with, so you only need to boost moly by 130 to get 200 ppm, right?
Therefore,
130/4365 = 0.0297 or about 0.03, same as we got before since 4,365 >>> 70. 0.03 times 5 quarts times 32 oz/qt = 4.8 oz