Maybe I'm asking more from the car than I should be, but when it hits 95+ deg F out here, I can't make more than 70 mph without the water temps climbing towards 110 deg C.

Everything's in tune; valves adjusted, tires inflated, EGR's "fixed", new thermostat & fan clutch, flushed the coolant, cleaned the radiator.. but I'm still running hot at high speed. The car's always done it too, so it's nothing new but..

I like going fast

So I'm thinking about buying a 500SEL radiator and mounting the oil cooler under the bumper (I had AN fittings TIG-ed onto the oil cooler years back, so it'd be easy to move).

The V-8 radiators are thicker and about 15% more cooling area. If I can run 70 mph at 100 C, then that should mean I could run 80 (speed of traffic on I-210) at 100C with the new radiator.

Thoughts?

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'82 300SD 351k