Hi everyone!! I just joined this forum today since I an a new owner of a 1982 380sl here in Southern California.
I did a search on this forum on "seafoam" and I'm surprised that nothing came up. Has anyone used this on their 380sl and would there be any adverse effects I should be aware of.
This car had been sitting for about two years now and after a lot of tune up care I've done it still has a bit if a rough idle and puttering during acceleration.
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Welcome. New here as well. I just Seafoamed an 87 560SL, mainly because it had been sitting for about 9 months. It's essentially a solvent (Naptha), lubricator (Pale Oil) and alcohol (old method of stabilizing fuel and octane booster). I've always had noticeable results on older cars…100K+ miles. A little buildup in the top-end can create small ticks that would lead you to think it's bad valve guides or lifters, when it's really just gunk throwing the tolerances off (it doesn't take much)…especially if the car has been sitting and the fuel has gone south.
On this 560, it eliminated some minor ticks and clicks and brightened it up quite noticeably in short order. I wouldn't put it in the crankcase to save my life, but half in the intake and half in the gas has always treated me well.
Just be slow with it as it burns hot and if your CIS is running at all rich, this stuff can heat your cat up pretty quickly if you have one. It's essentially a very high octane solution.
Also, I would add it (very
slowly) directly to the intake metering plate to ensure it gets to all cylinders. The vacuum line method doesn't distribute it very evenly. Just dribble it incrementally…you'll hear the engine stumble and pick back up. Too fast and you'll hydrolock and that'll be game over.
Last thing – if you go nice and slow with it, you may not see much smoke, which is fine. The billowing white clouds you see on YouTube is just the sea foam burning off…not carbon…which is why some people chalk it up to snake oil.
With all of that, I'd do it once and be done with it. Moving forward, stick to Techron…it should be all you need.
Also, two years is a very long time. I'd guess that your fuel delivery isn't operating as it should. Also, in my case the ignition setup was all original…wires, cap, rotor, coil etc. It'd be worth swapping that all out. Especially the coil…even the slightest output issues can create some marked performance issues.
Let me know if you notice a difference!