I need a brake flush in my 2015 Mazda3, and while the manual specifies DOT3, I have a large unopened bottle of DOT4 I had bought for a future job on my old car. I understand that DOT4 can be used in any application where DOT3 is specified without harm, but I was also thinking that since this car is a 2015, Mazda could have specced it for DOT4 in the manual but didn't, and DOT4 is not even mentioned. However, it seems that DOT4 is a flatly superior product.
Is there some sort of advantage to DOT3 over DOT4 that I'm not aware of, or was the DOT3 spec just a matter of cost? I guess to rephrase the question, I know I CAN use DOT4, but SHOULD I?
Is there some sort of advantage to DOT3 over DOT4 that I'm not aware of, or was the DOT3 spec just a matter of cost? I guess to rephrase the question, I know I CAN use DOT4, but SHOULD I?