Vintage Sears Garden Tractors
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18HP,TWIN CYLINDER ONAN MOTOR. 1976 MODEL, OIL CH

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18HP,TWIN CYLINDER  ONAN MOTOR. 1976 MODEL, OIL CH Empty 18HP,TWIN CYLINDER ONAN MOTOR. 1976 MODEL, OIL CH

Post  CARED on December 24th 2019, 3:49 pm

OIL ADDITIVE OF ANY BENIFIT TO BE ADDED WHEN CHANGING OIL IN THIS UNIT. IF SO--WHAT TYPE OR BRAND
CARED
CARED

Number of posts : 5
Registration date : 2019-10-28

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18HP,TWIN CYLINDER  ONAN MOTOR. 1976 MODEL, OIL CH Empty ONAN OIL CHANGE

Post  Georgia SS on December 24th 2019, 7:24 pm

THE BEST WAY TO MAKE THIS OLD BABY LIVE IS TO USE ONLY DIESEL 15/40 OIL, BRAND OF YOUR CHOICE I ALWAYS USE 1/2 BLUE BOTTLE OF STP. DON'T EVER LET OIL LEVEL RUN LOW, IF SO IT WON'T BE VERY PRETTY, MOST ALL ONANS USE SOME OIL, SO CHECK OFTEN, IF THE ONAN HAS A OIL FILTER CHANGE OFTEN, BOUGHT A SEARS SUBURBAN 5 YEARS AGO TO RESTORE UPON TEAR DOWN FOUND OIL FILTER TO BE ORIGINAL WITH SOME FACTORY PAINT BUT OIL PLUG WAS WORN TO A NUB, THE SMALL PLATE COWERING THE OIL FILTER HAD NEVER BEEN REMOVED, THE OLD ENGINE TURNED OUT VERY WELL, PROBABLY 2000 HRS. ROUGH USE. DO NOT USE AUTO OIL. EXPLAINING WHY IS ANOTHER STORY

Georgia SS

Number of posts : 218
Registration date : 2011-09-15

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18HP,TWIN CYLINDER  ONAN MOTOR. 1976 MODEL, OIL CH Empty Onan Oil Change

Post  Midnight77 on April 6th 2020, 7:38 am

I have a 1978 GT18 and have been using a straight 30w during the summers and a little lighter weight as per the information shown on the lid of the air cleaner. Did not know that to use a diesel 15/40 oil. Am I still okay?

Midnight77

Midnight77

Number of posts : 20
Registration date : 2013-09-25

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18HP,TWIN CYLINDER  ONAN MOTOR. 1976 MODEL, OIL CH Empty ONAN OIL CHABGE

Post  Georgia SS on April 6th 2020, 10:21 am

Hi
The best advise you will get is in above post, If you use modern day auto oil you will possibly loose the cam shaft lobes.
Jimmy

Georgia SS

Number of posts : 218
Registration date : 2011-09-15

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18HP,TWIN CYLINDER  ONAN MOTOR. 1976 MODEL, OIL CH Empty Re: 18HP,TWIN CYLINDER ONAN MOTOR. 1976 MODEL, OIL CH

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