Formula
Interval = Published life × 0.5^((T − 190°F)/18°F)Select the oil in the machine, enter hours on the charge and average sump/discharge temperature. You'll get a recommended change interval, hours remaining, and the TAN limits to judge an oil sample against.
Verdict
Within service interval
Recommended change interval
8000hours
Published life: 8,000 hr / 2 yr · temp factor 1.00×
Remaining life
6500hours
19% of interval used
TAN limits for this oil
- New-oil TAN (typical)
- 0.20 max mg KOH/g
- Watch band
- ≥ 2 mg KOH/g
- Change / condemn
- ≥ 3 mg KOH/g
PAO: condemn at TAN ≥ 3.0 or +1.5 over new; synthetics tolerate higher TAN.
About Kaeser Sigma Fluid S-460
PAO synthetic (polyalphaolefin) · ISO 46 · 46 cSt @ 40 °C · max sump 220 °F.
Machines: Rotary screw (flooded).