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Stretching Generator Oil Change Interval

Discussion in 'Generators' started by DOCKMASTER, Jul 21, 2025 at 5:16 PM.

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  1. DOCKMASTER, Jul 21, 2025 at 5:16 PM
    #1
    DOCKMASTER

    DOCKMASTER Senior Member

    Joined:
    Feb 26, 2012
    Messages:
    1,562
    Location:
    Ketchikan, Alaska
    Do you stretch your recommended oil change interval on your gen by using synthetic oil? My NL 9kw and 20kw gens call for changes every 200 hours. No mention of difference between dino oil or synthetic or even a blend. Curious if folks are stretching these intervals using synthetic oil? The changes are simple are fairly inexpensive. That being said, sure seems like 200 hrs comes up pretty quickly. Especially on my 9kw which runs virtually any time we are off shore power.
  2. Capt Ralph, Jul 21, 2025 at 5:59 PM
    #2
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    13,897
    Location:
    Satsuma, FL
    Yes, We are using all synthetic on NL 12, 20, BMZ 20 (Isuzu 4LE1) and a kluge D1105, 9.
    Oil labs are coming back perfect past 300+ hours.

    I believe it was the synthetic oil that saved that D1105 when an intake valve stuck open and fuel washed the lung. The 9 is now all together yesterday and running great & strong.
    Yep, I under loaded a 9kw. Frack Me (FM).

    I queried NL years ago about synthetic. Official statement was dino oil was only approved under warranty.
    After that, no comment or concerns.

    We are a big believers in synthetic oils. Just wish it was available in CF-2, 40.