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Reply to "Engine Tune"

Mine will diesel a little now and again, usually after a long hard run on a hot day. I've gotten in the habit of easing the clutch out with it in gear with my foot on the brake as I turn the key off. And before anyone asks, my timing is adjusted correctly and the engine never knocks when running. But the car doesn't like prolonged operation at highway speeds, oil temperatures can get as high as 220 degrees on a hot day if I run for several miles over 60 MPH. I suspect the rear grille pulls a vacuum at high speeds which fights against the fan. If I stay at 55 or less there's no problem. I prefer back roads anyhow, so I haven't really thought about a fix.   

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