Mobil DTE 21
ISO VG 10 anti-wear hydraulic oil
Buy
| Retailer | Pack | Price | |
|---|---|---|---|
| McMaster-Carr | 5 gal | See retailer | Open |
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Key specs
| Spec | Value | Method |
|---|---|---|
| KV40 | 10 cSt | ASTM D445 |
| KV100 | 2.7 cSt | ASTM D445 |
| Viscosity index | 98 | ASTM D2270 |
| Pour point | -30 °C | ASTM D97 |
| Flash point | 174 °C | ASTM D92 |
| Density at 15 °C | — | typical |
Grade checks
- KV40 is inside ISO VG 10 (9–11 cSt).
- Computed viscosity index is 108 from the stored KV40 and KV100 (ASTM D2270). The listed index is 98, more than 2 points away.
Viscosity and temperature
ASTM D341 (Walther) fitted to the published KV40 and KV100. It is an interpolation between those two points, and it is not meaningful below the pour point. Move the control to read a temperature.
Classification
- Category: Hydraulic
- Attribute: Anti-Wear
- Synthetic: Conventional
- Copper: 1B
- Note: Hydraulic Oil
Equivalents
| Oil | Score | Why |
|---|---|---|
| Castrol Hyspin AWS 10 | 55 | same ISO 10, additive aw, conventional, pour -36 vs -30, flash within 15 °C |
| Chevron Rando HD 10 | 40 | same ISO 10, VI 48 vs 98, additive aw, conventional |
Scores use published typical data. This is not an exact equivalent, and it is not an OEM approval. Confirm the substitute with the machine builder.
Documents
Related: Mobil, DTE 20 Series, viscosity index calculator, ISO / SAE / AGMA chart.
Questions
Is Mobil DTE 21 an ISO VG 10 oil?
Yes. The catalogue lists it as ISO VG 10, which is a kinematic viscosity of 10 cSt at 40 °C, plus or minus 10 percent (9 to 11 cSt). Confirm the current data sheet before you fill a machine.
What is a Mobil DTE 21 equivalent?
No other brand in this catalogue clears the equivalents bar for this oil yet (same application, same grade, compatible base oil, and a score of 60 or more). That is not proof that nothing else works. Check the machine manual.
Can Mobil DTE 21 be mixed with another oil?
Mixing two oils that share a base family is sometimes done and sometimes a mistake. Do not mix this oil with a PAG. For any other mix, follow the maker's change-over guidance and the machine manual.
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