## Common ground
All options are types of petroleum-based oils used in industrial or mechanical applications, primarily for lubrication or protection.
## Options at a glance
**2710.19 – Hydraulic & protective oils**
- **Defining trait:** Contains ≥70% petroleum or bituminous mineral oil; not biodiesel or waste; intended for hydraulic systems or protection.
- **Typical examples:** New hydraulic fluid for construction machinery, anti-corrosion protective oil.
- **Best fit when:** Used in new equipment, non-biodiesel, non-waste, and specifically for hydraulics or protection.
**2710.20 – Biodiesel-lubricating blends**
- **Defining trait:** Contains ≥70% petroleum/bituminous oil but includes biodiesel; not waste.
- **Typical examples:** Eco-friendly lubricants with bio-additives, biodegradable hydraulic oils.
- **Best fit when:** Formulated with biodiesel additives for environmental performance.
**2710.99 – Waste oils**
- **Defining trait:** Used oil no longer fit for primary use (e.g., recycled or spent).
- **Typical examples:** Used hydraulic oil from maintenance, used lubricating oil from engine drains.
- **Best fit when:** The oil has been used and is being discarded or recycled.
## Key differences
| Feature | 2710.19 | 2710.20 | 2710.99 |
|---------------------|------------------------|-------------------------|-----------------------|
| Base type | Petroleum/bituminous | Petroleum + biodiesel | Waste/reused |
| Biodiesel content | None | Yes | Irrelevant |
| Reuse status | New | New | Used/spent |
## How to choose
- Is the oil new and not made with biodiesel? → 2710.19
- Does it contain biodiesel and is still new? → 2710.20
- Is it used or no longer fit for primary use? → 2710.99
## Overlaps & pitfalls
- A used hydraulic oil with biodiesel could fit both 2710.20 and 2710.99, but **2710.99 takes priority** if it’s waste.
- “Hydraulic oil” in 2710.19 implies new, non-waste use—do not confuse with recycled or used versions.
- If biodiesel is present and the oil is used, prioritize **2710.99** over 2710.20.
- The main function (e.g., hydraulic use vs. lubrication) does not override material or status; **status (new/waste) and composition are key**