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Home›Repair guides›Cummins/Onan›Changing Engine Oil and Oil Filter

Cummins/Onan 4.0BGEFA261 OOL / 4.0BGEFA26100L — Changing Engine Oil and Oil Filter

Maintenance · Engine oil drain valve and oil filter

For the Cummins/Onan 4.0BGEFA261 OOL / 4.0BGEFA26100L, from the Cummins/Onan operator's manual.

Applies to: Cummins/Onan EM (SN5782U1G2RA) engine

Before you start

  • Contact with used engine oil can cause cancer or reproductive toxicity; limit skin contact and breathing of vapors; use rubber gloves and wash exposed skin.
  • Crankcase pressure can blow hot engine oil out the fill opening causing severe burns; always stop the genset before removing the oil fill cap.
  • Too much oil can cause high oil consumption, high operating temperatures and oil foaming; too little oil can cause severe engine damage.

Procedure

  1. Place a pan under the oil drain plug; run engine until warm, then shut it off.
  2. Remove the oil fill cap.
  3. Open the oil drain valve and allow all oil to drain from the engine.
  4. Close the oil drain valve.
  5. Spin off the oil filter canister, drain it of oil and discard according to local regulations.
  6. Thoroughly wipe off the filter mounting surface.
  7. Make sure the gasket is in place on the new filter canister and apply a thin film of oil to the gasket.
  8. Spin on the new filter canister by hand until gasket just touches the mounting pad, then turn 1/2 to 3/4 turn more; do not over-tighten.
  9. Refill with API Class SG or SH oil of the proper SAE viscosity grade.
  10. Check the oil level and add oil until the full mark is reached.
  11. Screw the oil fill cap on securely.
  12. Dispose of used oil properly at a recycling center or automotive service station.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Oil capacity (with filter) 3.5 quarts (3.3 l)
  • Turn new filter an additional 1/2 to 3/4 turn after gasket contacts mounting pad

Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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