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Ok, I'm frustrated. I have a 2001 Nissan Pathfinder with just over 100,000 miles. This is Nissan's 3.5L VQ series V6. I've been getting high silicon & lead readings and figure out what's going on. The air filter seems to have a good seal & it looks clear just downstream of the filter. I don't...

Ok, I'm frustrated. I have a 2001 Nissan Pathfinder with just over 100,000 miles. This is Nissan's 3.5L VQ series V6. I've been getting high silicon & lead readings and figure out what's going on. The air filter seems to have a good seal & it looks clear just downstream of the filter. I don't...