Low Oil
Generac Engine oil level below sensor threshold

Controller shows 'Low Oil' or 'Add Oil' and prevents start; oil level is near or below minimum on dipstick.

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Possible Causes

Insufficient oil after last service, Oil consumption due to worn rings or valve seals, External oil leak, Unit installed out of level causing false low reading

How to Fix / Troubleshooting

Safety: Ensure the generator cannot start automatically. Allow the engine to cool before checking oil.

  • Verify level and add oil: Check the dipstick on level ground. Add the correct grade of oil slowly, rechecking until the level is at the full mark. Do not overfill.
  • Inspect for leaks: Examine the base pan, under the engine, and around the oil filter and drain for wet oil. Repair or replace leaking components (filter, drain plug gasket, crank seals).
  • Check unit leveling: Confirm the generator pad is level. If the unit is significantly tilted, correct the installation to ensure accurate oil level sensing.
  • Monitor consumption: After topping off, log oil level over several test runs. Excessive consumption indicates internal engine wear and may require professional service.
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Repair Difficulty

Easy 2/5

Required Part

Engine Oil
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