Carbon Build Up: Can it be DIY or should it be done at a shop?
My 2010 Toyota Matrix has 254,000+ km. My last visit for schedule maintenance they recommended engine cleaning for carbon build up (paraphrasing, pretty sure they used other terminology).
At the time I said no. They wanted $150 for it and said it was an additive they put in or something like that.
I know carbon build up can affect fuel economy and other things. I have the 2.4L and right now I get around 450km/tank (50L tank).
Could this crumby fuel economy be due to that? If so, is it worth spending $150 to get it done or is there a solution I can buy at CT and do it myself?
Again, I'm not well versed on this topic.