This is still regarded as a great way to keep the engine clean inside. For those that manuals, do you WOT on every shift, even if your not bringing the rpms up that high? If you have a manual trans, and you have control over how high the rpms go, wouldn't it be a good idea to WOT as much as possible? WIth an automatic, WOT would result in high rpms/redline shifting. That wouldn't be as good on a continual basis I would think. Thoughts?