<It's ok now with regular maintanence.>Please speak proper Billish now whenever you talk to Bill -- Seafoam is a word he understands, "regular maintenance" is another one of them foreign language terms to him.
To Bill, oil should be red, not black. Remember, he wants you to put Seafoam into both your oil and your gasoline.
Try asking him "Why?" and it will only confuse and distress him.
Stop trying to confuse him, especially with data or facts.
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For example, don't do this to him -- this would be cruel and unusual punishment for nice ol' Bill.Fact, if you put a strong detergent package oil into a dirty engine, the new oil quickly picks up the pre-existing crap from every nook and cranny and suspends and holds it (that is if your oil is good enough to do this).
It will get black in a hurry if it is doing its job properly.And as Boofer and JOG are trying to tell him (using them funny foreign sounding terms again) if you use a good oil regularly you can KEEP a nice clean engine. Once the engine is clean the new oil stays clean a nice long time, but eventually it turns black anyway as you make some nasty stuff simply by running your engine.
The red stuff turns black too, if you would actually run it for a few thousand miles. But that would require you to actually ride your bike that much.