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States it right on the can.I would check and see if Seafoam still advertises it for diesel... I believe there was an issue...
Might be a coincidence but I toasted an IP shortly after adding seafoam....and I'm not the only one...
May be coincidental, or they were on their way out and I just expedited the process, but more than a couple people have complained..
I added a can yesterday and do so every month.
No issues after two plus years.