The Kohler 30REOZK is a 30-kilowatt diesel commercial standby generator powered by a Kohler diesel engine at 1800 RPM. It is designed for commercial facilities, healthcare, education, and government applications where diesel fuel independence is required. The unit features a 4-pole rotating-field alternator with PowerBoost excitation and is available with durable enclosures rated for 186 mph wind loads.
OnPoint services Kohler REOZK diesel generators throughout Northern California. The 30REOZK sits in a popular size band for small commercial buildings and branch offices, and we typically structure these accounts around an annual PM plus semi-annual fuel and filter inspection.
Tell us about the application — kW, voltage, application, install timeline — and we'll respond within one business day with budgetary pricing, lead time, and any sizing notes.
Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.
Estimate runtime on this tank
Estimated runtime
99.7 hours(4.2 days)
Fuel consumption ≈ 2.01 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.
Service intervals
Manufacturer-recommended intervals for the Kohler 30REOZK under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 250 hours or 12 months
Coolant change
Every 2000 hours
Air filter
Every 500 hours
Fuel filter
Every 250 hours
Major overhaul
≈ 8,000 hours
Load bank test
Every 12 months
Common failure modes
What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.
Component
Symptom
Typical hours
Severity
Fuel quality / degradation
Injector fouling, hard starting, reduced power output
4,380+
moderate
Coolant thermostat
Overcooling at light load, extended warmup time
8,000+
minor
Battery (starting)
Slow crank, failed exercise, low voltage alarm
8,760+
minor
Frequently Asked Questions
What engine is in the Kohler 30REOZK?
The 30REOZK uses a Kohler diesel engine rated at 1800 RPM, EPA certified for stationary emergency standby use.
Is there a Tier 4 Final version of the 30REOZK?
Yes. The 30REOZK4 is the EPA Tier 4 Final variant of this model, certified for both stationary emergency and non-emergency applications.
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Need service or parts for the Kohler 30REOZK?
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