Bargains do come around. Last month of Facebook was a pretty clean W109 3.5, air bags/valves done, lot of bits & pieces by the owner, clean body and interior, $17k! Messaged him it wouldn't last long, he just wanted a quick sale, and a week later...

The Penrite site I am looking at do not recommend a coolant. Oil and transmission fluid, yes, but no coolant.
I have a W109 with a 3.5 V8, which is the one you recommend? Part number?
I use Zerex G-05 in my W109 3.5. It is approved by MB for use which is good enough for me and can be had premix for $25 for 5 litres from Big W. I have read it is coloured yellow in the US compared to green here....

Thanks Andrew, went for a long drive last weekend and that drone gets really annoying...
Statistics: Posted by matthewz108 — Fri 23 Aug, 2019 6:11 pm

Craig,
It's hard for me to notice any degradation in performance because subjectively - loud always sounds faster, if you know what I mean. I'll test it when I get out on the open road.
Andrew

Hi Mathewz,
The muffler code is Walker 45924. It is pretty quiet but then I have a fairly significant centre resonator too. I can still hear the quieter v8 burble. With the small straight through all I heard was drone under 1800rpm.
Andrew