Hi, Has anyone use seafoam with regularity in their rig? I have high mileage Tundra and Sequoia, 270k, 196k and I will occasionally every 6 months put in some techron fuel injector cleaners but have heard good results about seafoam... readng further some also mention that if you haven't used SF from the beginning and starting to use it later on in the engines life it may unclog some things and do more harm than good. If anyone has used it late in an engine life with good results would like to hear your thoughts. Thanks