ArmyGuy45

Anyone here put Seafoam in their oil before a change? Does it clean as prescribed?

ArmyGuy45

So nobody here has put Seafoam in their motor to see if it cleans it and does not cause damage to the plastic internals?

2008__XL

I wouldn't put that stuff anywhere in my truck.

Summers22

iTrader: (2)

If you use a quality oil, it has additives that clean the internals.

PerryB

Anything with significant "solvent" properties is likely to dislodge sludge and other built up deposits and send them to the sump, where they will get sucked into the pump screen and the nightmare begins. I wouldn't.

Unlimited HP

I add Seafoam to my engine oil before each change. I follow the directions, something like 1 oz. for each quart of oil in the crankcase. I put it in a week before the change and make a point of not towing anything during that time. I understand Your concern but it hasn't caused any problems for me. I would not exceed the recommendation.

2008__XL

Out of curiosity, what good has it done for you to the point you've seen results? Just curious.

lutter5-0

I saw a bunch of gunk come out the drain plug on my 1994 pushrod 5.0 Mustang. I've used high mileage oil for awhile, and tried it once, prob had 150k at the time. Drove like a hundred miles or something before draining.

Unlimited HP

I started using it at 90k miles. That oil change resulted in some significant debris including a sheet of varnish that rolled out. I wasn't expecting anything the first go round but that was a surprise. I'm up to 117k now so the last change was number 3 with the Seafoam and I don't see anything out of the ordinary. My understanding is Seafoam is a solvent/cleaner so whatever comes loose is dissolved into the engine oil. Let me add that I add Seafoam with the engine up to temperature and running. That way it isn't going into a dry valve train or sitting on the valve cover gasket. I recall reading about someone who added a full can of Seafoam to their oil and they believed it resulted in eating a hole in a vacuum hose. No way to know if this was really why, I replaced several vacuum hoses on my 04 before I knew about Seafoam.

ArmyGuy45

Thanks for the input. I will try it on my next oil change and see if anything crazy comes out.