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While detailing my M38 I have found that many of the Grease zeros (not all) have red on them, also the plugs on the differentials and the guards which are screwed onto the valve stems. Was this standard? thanks!

Depending on period and which service units both Red and yellow were often used in the field.

Thank you Wes. To be specific so I will know what to do. My jeep is noted in my signature. U S Army Infantry
Tire tube valve covers red? All Grease zerks red? Differential plugs red?

Thanks

Without any additional input I will assume the color red is out and all plugs and zerks will be OD.

The red was applied in the field. If you want the jeep the way it left Willys do not use red.