Originally Posted By: CastroPenzoHavoMobil1
OP here...
I asked Castrol this question, and here is their response...
Here's a quote from correspondence that I've had with one of Castrol's formulating chemists...it's specifically about two 0Ws being a 0W when mixed.
Quote:
Hi
It's an interesting one. Certainly no guarantee of 0W being achieved but without knowing the oils it's difficult. Often PPDs are universal across an additive suppliers range. But if you had two oils with different DI, PPD and VII you might cause problems with used oil. Even if Ccs is ok for 0W
MRV can also run into problems when certain VMs are combined with other PPDs.
In my own car I will only top up with oils using the same additive system. (Diff grade can be ok if I'm desperate ) but I want to ensure no issues. (Eg silicates and sulphonate detergents mixing are not ideal either)
OP here...
I asked Castrol this question, and here is their response...
Here's a quote from correspondence that I've had with one of Castrol's formulating chemists...it's specifically about two 0Ws being a 0W when mixed.
Quote:
Hi
It's an interesting one. Certainly no guarantee of 0W being achieved but without knowing the oils it's difficult. Often PPDs are universal across an additive suppliers range. But if you had two oils with different DI, PPD and VII you might cause problems with used oil. Even if Ccs is ok for 0W
MRV can also run into problems when certain VMs are combined with other PPDs.
In my own car I will only top up with oils using the same additive system. (Diff grade can be ok if I'm desperate ) but I want to ensure no issues. (Eg silicates and sulphonate detergents mixing are not ideal either)