At around 60k to 70k... a can of BG44k that is twice the percentage of chevron, and will do the trick.
However... new truly direct injection cars are now developing a new problem... as the fuel is truly directly injected into the engine, and not through the manifold, intake valve path, we are seeing the intake valves being coked up due to egr gas being injected through this path. In earlier engines, the gas was also fed through this path and kept is clean... but new direct injection engines dont have that benefit of cleaning anymore.
SOOOOOOOOOO..
some cleaner needs to go through the gas system and clean the injectors...
and.... some cleaner needs to go through the air path,, and clean up the intake valves...
in the last couple of years there are more and more service bulletins on cleaning up the intake valves.
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Today's Featured Article - Talk of the Town: Removin Broken Bolts - by Staff. Another great discussion from the Tool Talk Discussion Forum. The discussion started out with the following post: " How would I remove a bolt thats broken off in a piece of metal and I want to save the treads in the metal and then put in a new bolt. "
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