Are you sure that's coolant stop leak...it looks like a head gasket sealer.

I appreciate everyone's help here, I've decided to go ahead and put in a new radiator and water pump while I'm at it. I just drained the tranny fluid and put in a new filter, may as well get the dirty fluid out of the radiator by just ditching it. One more reason to do the job right.

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1986 300SDL, 362K
1984 300D, 138K

whatever it was - it was like slippery muddy clay and it did cause me headaches - 2 water pumps in short order.

I believe that headgasket sealer and radiator stop leak would be the same as I have never used such products myself - I can be wrong.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

I think the headgasket sealer and radiator stop leak products are different. Not sure, I was researching it some but it was tough going. I have the radiator out and, oh yes, it's been leaking.



Found a new water pump at NAPA for $42. I asked for brand he said 'the NAPA brand.' Chinese no doubt. Probably better than a reman from O'Reilly's.

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1986 300SDL, 362K
1984 300D, 138K

We did use it in every car engine we had .But it was used to stop leaks from starting.The makers recomend you use it , to condition the coolant system on every flush .Good luck .

I dunno, Bars Leaks might have worked but the more I thought about it, it's useful for limping home (from a distance) in an older rig. My van, though not a spring chicken, is a solid workhorse.

The radiator install not too bad, had to move a good bit of stuff out of the way, oh well, it's a van. I got a Murray (Chinese of course) from O'Reillys for under $130 with tax. Plastic tanks and aluminum core. Works so far.

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1986 300SDL, 362K
1984 300D, 138K

I've had two plastic tank tops on my Land Cruiser leak where the plastic is crimped to the metal. Finally gave up and went to an all metal radiator.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13