I have now used Seafoam (1 oz. per quart of oil ) at the end of oil changes (i.e. last 200 ~ 300 miles) in all my rides with no ill affects . I use synthetic oils in all my rides at normal / shorter intervals and in every case - the oil came out darker on the dip stick (before & after) using Seafoam ... I then drained the vehicles while warm then refilled with what ever synthetic oil WM has on rollback : Pennzoil Platinum , Mobil 1 or Valvoline Advanced + Fram Ultra oil filter. Will I be using Seafoam before every oil change ? No , but for every 20K miles or so I see nothing wrong with my protocol of using Seafoam for the occasional removal of deposits that a synthetic oil may not remove . Lastly , Seafoam is available at all WM's and is relatively cheap ... Lastly , I do not use Seafoam in my gas tank (nothing wrong with doing so) - I just prefer to use a gas additive with PEA instead .
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