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Also question is, is engine oil considered hazmat?
What are the Hazmat requirements to ship aerosol or motor oil quarts? Vehicle motor oil is not considered a hazardous liquid and is technically, non-flammable. USPS does ship vehicle motor oil.
Also asked, what is considered ORM D?
ORM-D (other regulated materials for domestic transport only) is a marking for mail or shipping in the United States. Packages bearing this mark contain hazardous material in a limited quantity that presents a limited hazard during transportation, due to its form, quantity, and packaging.
Materials marked "ORM-D" and shipped by UPS Ground within the 48 contiguous states, UPS Ground Intra-Oahu and Intra-Alaska do not require hazardous material shipping papers. Print the ORM-D or Limited Quantity marking and securely affix to your package.