Seafoam is ok for an intake treatment but it won't clean the backs of valves and adding it to a crank case isn't going to do much (or maybe anything...) My experience is off the shelf engine oil flush is just massively marked up diesel. Might have some other additive to it but it has the same consistency, similar smell and will dry your skin out exactly the same as diesel would. The bottles would all state it contains 'hydrocarbons' which is such an ambiguous description it could be anything. I have driven for a day with diesel/oil blend (and with it a litre lower in capacity) on high mileage engines without any ill effects. Had good results every time. Cleaner oil between regular changes, quieter hydraulics directly after full oil and filter change.

If you want to give it a shot - http://www.mightyram50.net/vbulletin...ll=1#post49592

*if the oil capacity on the V6 is greater than the approx 3.6L recommended on my post, simply fill to specs. Also go on the hunt for a bigger capacity oil filter..