Formula
Life = Base × Duty × Env × 0.5^((T − Tref)/18°F)Estimates remaining hours on the current oil charge from operating temperature, duty and environment. Optional oil-analysis inputs (TAN, viscosity change) override the model when readings say the oil is done.
Oil analysis (optional)
Change limits: TAN ≥ 2.5, viscosity shift ≥ ±15%.
Verdict
Within service life
Rated life at these conditions
9699hours
Base 8000 hr · temp factor 1.21×
Remaining life
8499hours
12% of life used
Notes on PAO synthetic (poly-α-olefin)
Standard OEM-recommended synthetic.
Temperature rule: every ~18°F (10°C) above the oil's reference operating temperature halves service life (Arrhenius). Discharge temperature is measured at the pump discharge, not the receiver.