I wouldnt hesitate to get on it. As long as you have allowed enough time for the engine oil to be evenly distributed throughout the engine and all components are now being lubricated, there will be no detrimental effect from flooring a cold NA diesel engine. These are not super high tech engines that require proper clearances only acheived after reaching normal operating temperature. If this engine revved to 15,000 rpm or more, I might change my opinion.

This is just my opinion BTW

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1983 300SD.....169,000 miles but quit counting a few owners and unknown years ago!