Big Seafoam OOPS, 79 300TD - Page 2 - Mercedes-Benz Forum

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post #11 of 14 (permalink) Old 10-20-2011, 07:16 PM
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get used to fly. You should see what he did to his real plane, that was on the background of his old signature picture
By taking slow I mean don't expect the car to start burning the rubber after the purge, or oil change.
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post #12 of 14 (permalink) Old 10-20-2011, 11:47 PM Thread Starter
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Thanks. I'm just wanting to head up to southern Oregon in a week and a half and am trying to decide if I should drive her up there.
I just went up to Mt. Shasta and back (from the bay), which went fine on the way up but she was gettin tired on the way back. I think I'm gonna see how it goes after the oil change and diesel purge and if the blowby is any better. The Siskiyou Pass can be tough on the old ones.
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post #13 of 14 (permalink) Old 12-04-2011, 12:37 AM
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My 2 cents is use Mobil 1 synthetic 0W-40 (MB uses this in almost all of its engine). Use Seafoam or Diesel Purge in the fuel (videos on YouTube) and change fuel filters and change them again any time you feel that "she aint pulling the hill very well" feeling. Use the Seafoam in the crank case for about one hour and change the oil & filter. Unless there is physical damage to the motor you will feel a difference.

Also have the valves adjusted. This can make a huge difference on diesels with mechanical lifters. Mercedes Diesel Valve Adjustment Procedure

A good test to determine if you have had results is the 40-60 mph test. Time 40-60 several times so you have a good average. After doing the diesel purge or seafoam test again. I gained about 1-2 sec on my 300sdl.

You can use diesel purge or seafoam for this...

Diesel Purge Mercedes diesel maintenance tips
Diesel Purge Injection System Cleaner kit with Instructions |
300SD Mercedes-Benz Heaven: Performing diesel purge
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post #14 of 14 (permalink) Old 12-05-2011, 11:40 AM Thread Starter
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Supposedly the valves were adjusted shortly before I bought it, not that it doesn't need another valve adjustment...
I did a diesel purge and the smoke went down a little bit, but the blow-by isn't any better.
I actually put up another post trying to fix my blow-by:

I soaked the piston rings in MMO for three days and now have driven about 1000 miles with royal purple synthetic in there, blow-by isn't much better still.

I definitely want to do something to remove all the carbon build-up but don't want to damage things further.
Someone was suggesting using gasoline in the crankcase, as in the thread above.

Last edited by reinventthewheel; 12-05-2011 at 11:44 AM.
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