I ran across this post and it had me worried as I have been using seaform at least every couple months in my oil and fuel for quite some time. The can has always said it's fine in the oil for extended periods of time, but still scared me and I changed my oil today.
Afterwards I went to seafoams site and read this...
The most frequently asked question about using Sea Foam® is as follows: “After using Sea Foam® in my oil, fuel, or through the vacuum line (to clean carbon from the combustion chamber) do I need to change my oil?” The short answer is: No you don’t have to change your oil after using Sea Foam® in any application.
When using Sea Foam® in your fuel or through the vacuum line for carbon cleaning your oil does not need to be changed. Using Sea Foam® in your oil, at 1 ½ ounces per quart, is a safe way to clean a crankcase, free up rings or free up sticky lifters as you drive. Sea Foam® is not a chemical engine flush and therefore, it will not damage internal engine components or plug the oil pick up screen. Sea Foam® is a pure petroleum blend with no chemical additives and is safe for long term cleaning or short term pre-service cleaning.
Sea Foam® is a blend of highly refined additive oils and is compatible with all motor oils including synthetics. It is safe for all internal engine components and will not affect any seals, gaskets or o-rings. Sea Foam® cleans oil deposits and varnish in your crankcase by safely/slowly re liquefying the old oil residue so contaminants may flow and be filtered. The longer Sea Foam® is in your oil the cleaner your crankcase will become. When adding Sea Foam® to clean oil, for long term maintenance cleaning, you must check your oil periodically for color and clarity, when your oil looks dirty change it. Because you added cleaning oil (Sea Foam®) to your oil you may have to change oil before the expected service interval.
When adding Sea Foam® to dirty oil before an oil change, for best results use 1 ½ ounces per quart of oil at least 100 miles before oil is changed.
Just thought I'd post to clear up this misinformation that had me worried..
Afterwards I went to seafoams site and read this...
The most frequently asked question about using Sea Foam® is as follows: “After using Sea Foam® in my oil, fuel, or through the vacuum line (to clean carbon from the combustion chamber) do I need to change my oil?” The short answer is: No you don’t have to change your oil after using Sea Foam® in any application.
When using Sea Foam® in your fuel or through the vacuum line for carbon cleaning your oil does not need to be changed. Using Sea Foam® in your oil, at 1 ½ ounces per quart, is a safe way to clean a crankcase, free up rings or free up sticky lifters as you drive. Sea Foam® is not a chemical engine flush and therefore, it will not damage internal engine components or plug the oil pick up screen. Sea Foam® is a pure petroleum blend with no chemical additives and is safe for long term cleaning or short term pre-service cleaning.
Sea Foam® is a blend of highly refined additive oils and is compatible with all motor oils including synthetics. It is safe for all internal engine components and will not affect any seals, gaskets or o-rings. Sea Foam® cleans oil deposits and varnish in your crankcase by safely/slowly re liquefying the old oil residue so contaminants may flow and be filtered. The longer Sea Foam® is in your oil the cleaner your crankcase will become. When adding Sea Foam® to clean oil, for long term maintenance cleaning, you must check your oil periodically for color and clarity, when your oil looks dirty change it. Because you added cleaning oil (Sea Foam®) to your oil you may have to change oil before the expected service interval.
When adding Sea Foam® to dirty oil before an oil change, for best results use 1 ½ ounces per quart of oil at least 100 miles before oil is changed.
Just thought I'd post to clear up this misinformation that had me worried..

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