I searched but needed a little more clarification. I have been seeing more synthetics in stores and online brake fluid, fuel infector cleaner, fuel system cleaners, etc....
I want to maintain my new engine but have questions after seeing the old rotors that came out of my previous engine(covered with carbon). How long should I wait to use fuel system or injector cleaning additives and what about sythetics? I'm just not sure how well 87 octane burns in the combustion chamber or should I even worry about it. Thanks in advance for the help.

 

I know I'm gonna get flammed for adding brake fluid but could someone give me you impression of this anyways? Has anyone used Royal purple gear oil for the rear diff. and tranny is it worth the money?