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Old 06-07-2009, 02:40 PM   #1
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What oil do you use in your gas Genset?

What oil is everyone using in their gas generators. I currently use shell rotella 5W-40 synthetic and interested to see what others are using and why.
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Old 06-07-2009, 06:31 PM   #2
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I have been using 15W-40 but the last time I used 5W-30 and now it seems to leak a bit more. I'll go back to the thicker oil before it gets to hot.
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Old 06-07-2009, 07:21 PM   #3
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I have been using 15W-40 but the last time I used 5W-30 and now it seems to leak a bit more. I'll go back to the thicker oil before it gets to hot.
That's interesting. I haven't had any leaks in my genset, and have had very good results with the 5W-40. I know that some have used Mobil 1 10W-30, maybe one of those folks will chime in. I am looking at going to it in my chassis engine. It would be nice to be able to use the same oil for both applications.
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Old 06-07-2009, 07:40 PM   #4
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I use Onan 15W-40 #326-5336 most of the year and Onan SAE-30 #326-5339 during very hot weather.
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Old 06-07-2009, 10:42 PM   #5
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I've used 10W-30 Mobil 1 synthetic since purchasing the motorhome in 2004. I like synthetic because it's great for cold weather starts and it gives me a little more slack in terms of oil and filter change intervals. I don't have to add any make-up oil so leakage or burning isn't an issue.

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Old 06-07-2009, 10:52 PM   #6
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Mobile 1 10w-30 in gen and 8.1 engine. No leaks or oil burning in either,

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Old 06-07-2009, 11:13 PM   #7
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Been using Mobil 1 Synthetic 5w30 in v10 engine now for several years and straight 30w non-synthetic in Onan 5.5 genset. Next genset oil change will probably go with same weight Mobil 1
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Old 06-07-2009, 11:58 PM   #8
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I have use 5-30 Mobil 1 all around may need Gen set start in cold of winter for power outage.
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Old 06-08-2009, 02:50 AM   #9
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Quote:
Originally Posted by FDchief View Post
What oil is everyone using in their gas generators. I currently use shell rotella 5W-40 synthetic and interested to see what others are using and why.
i am using AMSOIL 5w30 series 3000 SYNTHETIC oil in my engine, and AMSOIL 10w40 synthetic oil in my genny.
the "why" is that AMSOIL is the best oil made. better fuel economy, power, and engine life are some of the AMSOIL'S attributes. AMSOIL is one of the few fully synthetic oils manufactured.
most "synthetic" oils are extra refined petroleum based oils. CASTROL started that mess and when sued by the API got a judge to agree with them. so now just about all the oil manufacturers have a non-synthetic "synthetic" oil. mobile 1 has both. you have to read the can closely to tell what you are buying.
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Old 06-08-2009, 06:41 AM   #10
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Quote:
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What oil is everyone using in their gas generators. I currently use shell rotella 5W-40 synthetic and interested to see what others are using and why.
I follow the recommendations in my Onan manual. For my climate I use 15W40.
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Old 06-08-2009, 02:59 PM   #11
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I follow the recommendations in my Onan manual. For my climate I use 15W40.
Me too, I use the Onan brand, it doesn't take that much and I believe it is worth the cost.
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Old 06-08-2009, 04:05 PM   #12
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10w-30 Dino oil in the coach and Rotella 15w-40 in the Onan gennie.

Both are changed yearly or sooner if the mileage/hrs require it.
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Old 06-08-2009, 07:53 PM   #13
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Good input from all. I will be switching my motorhome oil from Mobil 1 5W-30 to Mobil 1 10W-30 for warm weather ops. I may do this also on the generator to keep it simple by using the same oil in everything, even my tow car.
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Old 06-08-2009, 09:27 PM   #14
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Rotella 15W-40.
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Old 06-15-2009, 08:52 AM   #15
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I use Rotella 15 w 40 also.
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