Just wanted to mention that I don't believe you need to pour the entire can in the gas tank. I only use about half or less.....maybe a third or so. I don't believe any adverse effects will occur for using the full can though. I have heard that the seafoam causes oil to thin or become dirtier faster because it cleans the crankshaft and the I guess you need to change at a more frequent interval, got that info from the guys on the forum....the people that make seafoam told me I could use it either before an oil change or after the oil change and I would not need to change my oil more frequently. So, I chose to still do it right before the oil change, let it do its thing, then, change it within the next day or 2. The guys on the forum are really intelligent and though the company says I can do either or, I see more of the logic as doing it right before the oil change so I don't leave the slightest bit of room for error.

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1990 190E 3.0L