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Stanley,
Cruzinperformance.com looks AWESOME! You have had good results from them?
Did a quick Ctrl-D on that page.
Now, I have to disagree with your statement above - "if you change your oil regularly, then you're already getting all of the gunk ad buildup out of the engine".
Most of us have not had our bricks since new. Add to that variables like dino oil in turbos, etc and IMO high mile bricks with sludge/varnish/gunk are not that uncommon (like mine purchased with 150,000+ miles). In these instances, I have not found a better product than the aforementioned auto-rx.
Ian
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