Quote:
Originally Posted by CrazyCatGuy
Walnut blasting is the preferred method from what I've seen on other makes.
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When they get to the point the valves won't seat then yes that's it. On the newer engines, it doesn't look like it will ever get to that point. GM makes a top engine cleaner you inject with the engine running which will do just fine. The thing with DI is there is no injector flow through the valve to clean it to the level people expect with a manifold injected car. Doesn't mean it's doing harm, just means it's not pristine like people are used to.