I am getting ready to do a de-oil and flush on the coolant system of my 85 300D. I saw this weekend that unless I could get my hands on a proper hose fitting to go in where the block plug comes out, I will make a huge mess and there would be no way for me to collect and properly dispose of ALL of the coolant.

Does anyone know the proper thread type and size of the plug?

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1985 MB 300D/T

Fell off the WVO bandwagon when people started trying to charge $2.50 a gallon for dirty vegetable oil.