I've got a new video of my 300SDL stone cold. It's always much louder when cold.

I hear at least two different noises. The loudest is a distinct hammer on steel bang at approx CYL#2 that's very predictable and doesn't change except when it warms up and gets a bit better.

The other is less rythymic and random, kind of like when you shake the balls in a paint can. What scares me the most is if either the chain is stretched and about to go or the original vacuum pump has let something loose.

Although this sounds awfull, at 1000 RPM and above the sounds are nearly gone and the cars runs awesome. I have no problem running with anyone here at 7500ft except I have to watch my temp closely.

No evidence of coolant loss and burns almost no oil.

300SDL Stone Cold - YouTube

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1987 300SDL (Grumpy) w/142k
2011 Jeep Grand Cherokee w/ Hemi
1989 420SEL (Sold) Awesome Car
1992 400e (Sold) Rocket