Originally Posted by raaizin
I topped off my daughters 2017 jetta SE with some G12+ I had from previous audi p/n G012A8G1G. I didnt look at specification as what was in the car looked pink to me. Probably put 3-4 ounces in as it was slightly below minimum mark. Afterward I looked up and see that it calls for G12++ which supposidley is not compayable with G12+. I think I should be ok as I only added a small amount. Whar makes these two incompatable
Your 2017 Jetta should spec G13 not G12++, as G13 was introduced more than ten years ago now to be used across the whole range.
However G12++ and G13 Have the Same corrosion inhibitors, the only difference is that G12++ is 100% Ethyene Glycol, G13 is 80% Ethylene Glycol and 20% Glycerin.
G12+ and G12++ are perfectly compatible too, G12+ is an OAT and G12++ is a HOAT With Silicates but they are compatible.