I'll bring this thread back to life...

I'm having the same issues with temps in my '91 350SD. It USUALLY stays pretty reasonable - around 100C or less, particularly on the freeway - but in stop-&-go traffic I have seen the gauge up to 115C. I just had my radiator flushed and refilled (they used the green stuff after I specifically asked for Zerex G-05!! DAMN!!) but it still went up.

I have been advised that anything over 110C is too hot for the aluminum head, so I will have it checked with my mech this week. Anybody else have advice? I know the manual says anything below 120C and below the red line is acceptable, but I would rather be safe than sorry!

Don - how did this work out for you??? Did you replace your radiator? Did it make a significant difference?

Thanks!
Rusty