I went to the dealership today and bought 3 quarts of CVT oil. I was shocked that the total came to $60. Being 18.50 for each quart.

Now I bought it I changed it but the oil is still pretty dirty so I'll have to do it a few more times eventually.

I don't want to pay that price again. is it okay to mix a different brand of cvt oil with this one? If so what would you guys recommend.

Also is there a transmission filter on these cars? If there is is it worth changing

2015 mirage RF. 67000mi.

Thanks.