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tomkaren13

West Central Florida

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Posted: 10/31/09 06:36am Link  |  Quote  |  Print  |  Notify Moderator
Have a recently purchased MH with an Onan 4000. Have some of the books about service but besides touting the use of Onan oil I can't find out what weight oil to use.

We are in FL and a little cooler weather is near.

Genset has 300 plus hours an meter.

Need input on what weight oil to use.

ronfisherman

SE Michigan

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Posted: 10/31/09 08:08am Link  |  Quote  |  Print  |  Notify Moderator
30 weight unless you are going to be using it in temperatures below degress 0.

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Dieselgem

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Posted: 10/31/09 08:18am Link  |  Quote  |  Print  |  Notify Moderator
Open the cover on you Onan it should be printed right on the front left along with the oil filter informaton. Do not put a single weight oil in the generator. Mine (a 5500)uses 15-40 for the best temperature range. I use the Onanmax which you can get from any Onan dealer.

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4*phun*2

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Posted: 10/31/09 09:01am Link  |  Quote  |  Print  |  Notify Moderator
5W40 Synthetic.

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HEMIDAZE

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Posted: 10/31/09 09:05am Link  |  Quote  |  Print  |  Notify Moderator
clip from the ONAN Manual

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fred v.

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Posted: 10/31/09 10:29am Link  |  Quote  |  Print  |  Notify Moderator
HEMIDAZE is right thats a chart as in my Onan manual. I use 30 wt in central fl as don't expect to use gen below freezing temp. fred

murffdog

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Posted: 11/01/09 06:06am Link  |  Quote  |  Print  |  Notify Moderator
Dieselgem wrote:

Open the cover on you Onan it should be printed right on the front left along with the oil filter informaton. Do not put a single weight oil in the generator. Mine (a 5500)uses 15-40 for the best temperature range. I use the Onanmax which you can get from any Onan dealer.


My book says 10-30, an Onan 4000 doesn't have a filter.

kcole683

Columbus Ohio

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Posted: 11/01/09 07:28am Link  |  Quote  |  Print  |  Notify Moderator
murffdog wrote:

Dieselgem wrote:

Open the cover on you Onan it should be printed right on the front left along with the oil filter informaton. Do not put a single weight oil in the generator. Mine (a 5500)uses 15-40 for the best temperature range. I use the Onanmax which you can get from any Onan dealer.


My book says 10-30, an Onan 4000 doesn't have a filter.


My Onan 4000 has an oil filter but it is an Emerald Plus.

rvten

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Posted: 11/01/09 10:46am Link  |  Quote  |  Print  |  Notify Moderator
Just what Onan calls for 10w30.

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Camper Ken

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Posted: 11/02/09 04:02pm Link  |  Quote  |  Print  |  Notify Moderator
Since I never run my generator at temps of 10 degrees or below, I opted for 15W-40 which is recommended by Onan for temps to 100 degrees. Onan's oil chart states to use 10W-30 for temps 0 to 80 degrees.

I'm more likely to run my generator in temps exceeding 80, than temps lower than 10 degrees.

See the link posted by Hemidaze.

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