Pumps
Pump oil capacity by pump
Oil capacity varies a lot between pumps, and some are sealed. Use the figure for your exact pump, never a generic number.
| Pump | Oil capacity | Oil type | Source |
|---|---|---|---|
| General Pump TS2021 (triplex) | 37 oz | 30W non-detergent | BE: General Pump TS2021 |
| AR XW3028N (triplex) | 37 oz | 30W non-detergent | BE: AR XW3028N |
| AR RG1528HN (triplex) | 19 oz | 30W non-detergent | BE: AR RG1528HN |
| Centurion P3 CP CTG1 (triplex) | 16 fl oz | 30W non-detergent | BE: Centurion P3 |
| AAA 10.0 GA13 (triplex) | 13 oz | SIMPSON pump oil 80138, or SAE 15W-40 | AAA 10.0 GA13 manual |
| SIMPSON AAA horizontal triplex replacement pump | 11 fl oz | Not stated | Walmart.ca listing (retailer) |
| OEM Technologies 90029 (axial) | Sealed | No oil changes | SIMPSON 90029 product page |
How often to change it
Intervals depend on the pump. As one manufacturer example, the AAA 10.0 GA13 manual says to change the oil after the first 50 hours, then every 100 hours or 3 months (AAA 10.0 GA13 manual). Follow your own pump’s manual.
Retailer-sourced row: the SIMPSON AAA horizontal triplex figure comes from a retail listing and will be replaced when a manufacturer document is found.
Sources checked 1 November 2026. This page does not claim hands-on testing.