The Kohler 1250REOZDD is a 1250-kilowatt diesel industrial standby generator powered by a Detroit Diesel/MTU 12V4000G43 V12 engine at 1800 RPM. The DD suffix indicates a Detroit Diesel/MTU engine platform, offering an alternative to the Mitsubishi-powered 1250REOZMD. Medium-voltage options (4160V–13800V) are available.
OnPoint Generators services Kohler REOZ diesel generators throughout Northern California. MTU-powered units require specialized service capabilities including medium-voltage expertise and large-capacity load bank testing.
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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
3.0 hours(0.1 days)
Fuel consumption ≈ 67.50 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 1250REOZDD under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 500 hours or 12 months
Coolant change
Every 6000 hours
Air filter
Every 1000 hours
Fuel filter
Every 500 hours
Major overhaul
≈ 20,000 hours
Load bank test
Every 12 months
Frequently Asked Questions
What engine powers the Kohler 1250REOZDD?
The 1250REOZDD uses a Detroit Diesel/MTU 12V4000G43 V12 engine running at 1800 RPM with Tier 2 emissions certification.
What is the difference between the 1250REOZDD and 1250REOZMD?
The 1250REOZDD uses a Detroit Diesel/MTU V12 engine while the 1250REOZMD uses a Mitsubishi V12 engine. Both deliver similar power ratings but differ in engine platform and parts availability.
Does OnPoint service the Kohler 1250REOZDD?
Yes. OnPoint Generators provides maintenance, repair, and load bank testing for Kohler REOZ diesel generators throughout Northern California.
Kohler is our primary recommendation for commercial standby power. We sell and service the full Kohler line — RCA residential, RCL light commercial, KG industrial diesel, and REOZ large-frame — and our technicians are factory-trained on every product family.
We are an authorized Kohler dealer with factory-trained technicians. Kohler is the majority of our new generator sales today, spanning residential through large industrial. Our parts inventory is stocked for same-day Kohler service.
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