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Yes you can. I spoke to Castrol customer service on 16 Feb 12 and asked if I could mix a left over 1 gallon bottle of the older Syntec with the newer Edge formula I just purchased. I was told as long as they are the same viscosity, they can be mixed.
This is from Castrols customer service after I emailed them this same question... Our previous Castrol SYNTEC product has been improved, renamed and repackaged as Castrol EDGE with Syntec Power Technology (SPT) however it remains in a black bottle and is fully compatible for use with the previous Castrol SYNTEC product so as always, you can use the same SAE grade of either product together for 'topping off' purposes without fear. The new Castrol EDGE with SPT is not only as good as the previous Castrol SYNTEC product that you were using but better!
why would you want to? Yes you could, the viscosity will average out .
If your asking about pre-mix oil that you mix with the gasoline, they recommend Yamalube "R" (Yamalube racing 2-cycle oil) Mixing ratio : 30:1 or Castrol A747 For the transmission and gearbox, Yamalube 4 (10W-30) or SAE 10W-30 type SE motor oil.
Oil and oil will mix.
To mix oil paint you have to choose the colored pigment and add it to the oil medium.
No we cannot mix water with oil.
nothing can relay mix with oil because the oil has a lot of density in it
Oil will not mix with water.
Yes you can mix different brands but I recommend you do not mix different weights. You can even mix synthetic oil with conventional oil. But as the weight of the oil is critical, do not ever mix one weight of oil with another, no matter if it is synthetic or conventional oil.
You can mix part synthetic oil with full synthetic oil.
Petrol and oil will mix, with the petrol acting as a solvent.