Thread: Royal Purple 20w50 oil

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been many post on oil and i posted this many times you can buy a pint of Zddp and added it and hope it works with your oil . lake speed tolds us that detergent oils and thats 99% of the oil out there will strip the ZDDP off the parts you want it on. or block it from working its way in to the parts so you will just have stuff laying in the bottom of the oil pan . i build /machine engines i buy oil made to work and that oil as ZDDP in it. brad pen or joe gibs this is the only oil i use on break in less a roller engine . were is really no need to run 20/50 but you may want a multi weigth . i like to break them in on break in oil get about 800 miles on them and then run what you want for oil i like to see my customers use good oil but you start getting past 6 +bucks a QT i worry that they may keep it in to long and get cheap when it needs to be changed out and use a good oil filter just about any fittler but fram . good ones are wix.s napa. k.n jomar

" There is approximate 1200 parts per million ZDDP in Rotella T 15W-40,
which is 50% higher than is allowed in Starburst motor oils (API
SN/GF-5). Thank you for your interest in Shell products.

Richard Moore "

from Shell Oil's answer to "Questions to our Chemists "



Jim