Originally Posted By: dtt004
I mix and match these two oils all the time...mainly because I have both in my garage. They go into my motorcycle and cars, except for my NSX...mainly because I feel it doesn't need it for the kind of driving I do with that car.
They are similar in makeup. We have analyzed both in our labs at work. Remember, there are only a certain number of compounds (amines and ethers for example) that will do what is required for an engine oil. All the fancy names for additive packages are more marketing for each company. For example, PTFE is marketed as Teflon by Dupont. But there are plenty of nonsticks that are PTFE (because PTFE is the only compound that does what it does), just not marketed as Teflon.
I seriously question this take on oil.
To give one example. A small level of the additive ZDDP + Boron gives better performance than a larger level of either just ZDDP or ZDDP + Boron. So, one oil uses ZDDP+Boron, and one uses just ZDDP at a higher concentration. Mix the two and the resultant oil has too much ZDDP for the synergistic function, and not enough to match the high ZDDP oil in functionality.
Concrete? NO. A mix as good as either oil by itself? notsomuch...