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I MIGHT consider adding it to the oil and letting it idle for a few minutes if I got a used car that was badly sludges up, but I would never drive it with Seafoam in the oil.
If I had a dying junker on it's last leg and had nothing to lose, I might try it as a last resort.
I do remember in the old days running ATF through old sludge filled motors to clean them out. It worked once in a awhile.
Honestly, and I may get **** for it but I have used Sea Foam in my oil before. I only had ever done it twice a year back when my car was daily driven. Back when I did EVERYTHING in my car. Dates, work, weekend racing, etc. I only placed it in the oil when a change was due as I know it thins the oil out pretty good. I also would not drive the car hard when it was in the crankcase. I would drive 50-100mi and change the oil. I know when I had my first cam change in the LS6 motor, my mechanic/tuner and his friend both complimented how clean the inside of the motor was. Hes been inside of a ridiculous amount of LS motors and he just kept saying mine was just ridiculously clean on the inside. In my time of using it, its never given me a problem. Ive also used it in the brake booster a few times and had loads of fun smoking out back roads.
I run it through my close to 485,000 mile work van once a year.. 1/3 in the tank, 1/3 through the PCV, and 1/3 in the oil a couple hundred miles before that oil change. But haven't ever even considered putting it in my Corvette.. no need for it.
I've been putting it in the van since it was in the mid 100,000's years ago, I had to replace valve cover gaskets around 350,000 and the valvetrain was spotless. I don't know if credit goes to the Seafoam or synthetic oil every 5,000 miles, but everything I could see looked practically new.
All I can say is OH MY... another thread full of misinformation... GM offers there own brand of this product, and is use extensively and safely when used in the manner in which it was designed.. Do A search... on Seafoam and the proper use of this product . and not as an oil additive..
Seafoam is a Top engine cleaner, designed to be ingested into the motor until stall. sit over night, and then on start up and run for 10/20 minutes , fog the neighborhood with dissolved carbon build up.
Typically, this is product that is used where carbon build up is a problem causing pre mature detonation.. I've never seen it in the lab, even after 200,000 miles. Many people seem to over think the need for products of this nature.. You don't see these types of products and additives in the maintenance schedule, noting that any real maintenance only occurs after 100,000 miles, and at that point the maintenance is very minor...Many people are very successful following the simple maintenance schedule and see 200,000 and even 400,000 miles without any internal engine issues.
All I can say is OH MY... another thread full of misinformation... GM offers there own brand of this product, and is use extensively and safely when used in the manner in which it was designed.. Do A search... on Seafoam and the proper use of this product . and not as an oil additive..
Seafoam is a Top engine cleaner, designed to be ingested into the motor until stall. sit over night, and then on start up and run for 10/20 minutes , fog the neighborhood with dissolved carbon build up.
The Seafoam can literally states that you should put it in the crankcase.
I did it with some Marvel in my truck. Someone wasn't religious enough with the oil changes and there was some sludge buildup in the valley and the lifters were full of it too. I ended up hot tanking the heads, cleaning the valvetrain, installing Comp Pro Magnums, scraping out the sludge, and running a quart of Marvel with dino oil for a week or so for peace of mind. Also took that opportunity to replace the bearings. While not worn, they had ingested some foreign material at some point in their life. Probably from when the PO had the intake gaskets done. In my case, regular oil changes were not enough to drive the motor clean.
Lots of previous discussions . . use the search feature . . .
Ah ok. I did. I scanned down C5 forum with a search of Seafoam and found nothing about Seafoam in the oil. So thank you very much for the common but otherwise useless retort.
I did, however, do a broad internet search, and found that Seafoam does clean intakes better than most on the market. In the oil, yes, it is probably no use unless you think you have water in your oil for some odd reason.
Check out ChrisFix on YouTube. He's made good use of a borescoope.