My "new" 2008 Elantra has 11,500 miles on it. I just added a slug of Techtron injector cleaner (12 gallon size) to a full tank of gas. How often should this be done? Also - when I do my next oil change would it be a good idea to shift to synthetic oil?
---MIKE---
>In the White Mountains of New Hampshire
>> (44=B0 15' N - Elevation 1580')