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#2164367 - 02/07/11 05:54 PM Best oil for a Generac generator
kdoss Offline


Registered: 02/06/11
Posts: 6
Loc: Missouri
I have a Generac generator that has a 30 hp V-twin air cooled engine, I am wanting to know what would be the best oil to use in it. I do not use it much, so it sits a lot of the time, but when I do use the generator it is in the winter time and spring. So the the operating temps are normally cool to cold. The oil that I am using right now is Mobil 1 5w30w truck & suv. Thank you for all your help.


Edited by kdoss (02/07/11 05:55 PM)

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#2164382 - 02/07/11 06:04 PM Re: Best oil for a Generac generator [Re: kdoss]
willix Offline


Registered: 12/16/09
Posts: 1889
Loc: minneapolis mn
You want an HEDO such as Delvac or Rotella in a 10w30 for a air cooled engine.
_________________________
96 Eldo, M1 5W30 EP
2010 Fusion SEL 2.5L M1 5w20 EP

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#2164390 - 02/07/11 06:16 PM Re: Best oil for a Generac generator [Re: kdoss]
eljefino Offline


Registered: 06/15/03
Posts: 28660
Loc: ME
Might be worth getting an IR gun to get the heat off the engine block and cooling fins. (or out of the oil sump). I bet it has a more than adequate fan.

My aircooled motorcycle runs 205'F on a 75'F day though it's linear so ten degrees more outside make it run that much hotter. 205'F is good 30 weight territory.

Does it have auto start and switchover? The 5w will be good for that load that hits it seconds after getting up to speed. And the extra additives make good preservative for sitting. I can't argue with your choice unless it gets super duper hot.

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#2164404 - 02/07/11 06:33 PM Re: Best oil for a Generac generator [Re: kdoss]
greenaccord02 Offline


Registered: 04/22/07
Posts: 5215
Loc: Houston, Tx, USA
I'd get a xW-40 HDEO. You need something that will stand up to some shear.
_________________________
  1. '95 Dakota 3.9L - M1 0W-40 - MC FL1A
  2. '97 Accord F22-B1 - M1 5W-30 - Bosch 3312
  3. '99 Camry 1MZ-FE - PP 5W-30 - M1-209

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#2164408 - 02/07/11 06:37 PM Re: Best oil for a Generac generator [Re: kdoss]
troyb43 Offline


Registered: 11/21/10
Posts: 168
Loc: VA
I put Amsoil 0W-40 in mine. Have checked the temperatures at the oil filter a few times, but it has never been over 40 degrees ambient temperature outside, the temps I got were near 175 with running 30 minutes wide open loaded up. Did notice at the oil cooler the temperature dropped about 15 degrees from one side to the other.

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#2164479 - 02/07/11 07:25 PM Re: Best oil for a Generac generator [Re: eljefino]
kdoss Offline


Registered: 02/06/11
Posts: 6
Loc: Missouri
It does not have auto start or switchover. I usually start it and let it idle for about five minutes before I put a load on the unit. I have not checked it with a IR gun, since I do not have one, but one thing in my favor, it does have a oil cooler on it.

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#2164583 - 02/07/11 08:49 PM Re: Best oil for a Generac generator [Re: kdoss]
tig1 Online   content


Registered: 01/03/09
Posts: 10967
Loc: Illinois
I have a friend that is a certified Gennerac tech. He uses nothing but M1 5-30 in all of his PMs. What you are doing will work well for you.
_________________________
2007 Ford Fusion 173,000 miles
M1 0-20 AFE
2007 Ford Focus 151,000 miles
M1 0-20 AFE
10,000 mile OCIs on both engines
M1 ATF
M1 10-30 in all OPE
MC filters


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#2165584 - 02/08/11 09:02 PM Re: Best oil for a Generac generator [Re: kdoss]
Donald Offline


Registered: 03/21/04
Posts: 16073
Loc: Upstate NY
Some Amsoil 4 stroke oil.
_________________________
2015 Subaru Forester 2.5 engine/CVT PP & M1
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1


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#2165823 - 02/09/11 06:20 AM Re: Best oil for a Generac generator [Re: kdoss]
Best F100 Offline


Registered: 09/19/04
Posts: 432
Loc: Tennessee
I have that same Generac engine in a 6 year old, 13 kw, natual gas fueled, auto start version. So I will tell you what I know.

All the Generac techs (and the book) recommend Mobil 1 5W30. In my experience, it is a good all purpose oil. There is a Generac forum. In it, some owners complained that Mobil 1 5W30 tends to be "consumed", or burns off during an extended power outage (longer than 40 hours of continuous operation). When that happens, the low oil level causes the generator to automatically shut off to prevent engine damage.

We have had 48 hour power outages in both 90F and 5F temperatures. Since I am not a fan of refilling a generator's oil level in a blizzard, I decided to switch to an oil that
is a bit more "stout" than a thin, car oil. In the winter, I use Castrol 0W30. In the summer, I have been using Amsoil MCT 10W30 motorcycle oil. During summer temperatures, I have also used straight 30 weight. It is cheap and works well. So far, no problems here. These synthetic oils might sound like overkill, but I know one thing; If I am out of town, and the power is out for several days, my wife will not fool around with a generator, to see why it shut itself off. She will go to a hotel instead.

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#2165873 - 02/09/11 07:52 AM Re: Best oil for a Generac generator [Re: greenaccord02]
ChiTDI Offline


Registered: 12/19/03
Posts: 2057
Loc: Chicago IL
Originally Posted By: greenaccord02
I'd get a xW-40 HDEO. You need something that will stand up to some shear.


Like Mobil 1 Turbo Diesel&Truck or Rotella T6 @ 5w40?

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#2165885 - 02/09/11 08:04 AM Re: Best oil for a Generac generator [Re: willix]
ChiTDI Offline


Registered: 12/19/03
Posts: 2057
Loc: Chicago IL
Originally Posted By: willix
You want an HEDO such as Delvac or Rotella in a 10w30 for a air cooled engine.

Are there cold starting issues with that choice? I sure like their protection and shear stability, though.

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#2167591 - 02/10/11 07:19 PM Re: Best oil for a Generac generator [Re: ChiTDI]
kdoss Offline


Registered: 02/06/11
Posts: 6
Loc: Missouri
I was considering a 5w40w like rotella but in the owners manual it made it clear not to use a 10w40w, so I thought that a 40w would be to heavy since they said a 10w30 was alright on temps above 50 degrees.


Edited by kdoss (02/10/11 07:22 PM)

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#2169885 - 02/13/11 10:50 AM Re: Best oil for a Generac generator [Re: kdoss]
-SyN- Offline


Registered: 06/20/05
Posts: 791
Loc: Tornado Alley
I poured in RTS 5W-40 right after breakin on my Generac... I've only had to use it 2 times this winter for a period of 24 hours... Our local Oriellys just started stocking M1 0W-40... After doing some reading on this oil... It seems it's one of M1 more robust oils... Only thing is... complaints of it shearing fairly easy... Any thoughts on this oil choice?
_________________________
14 Ram 5.7L-->PU 5W-30 w/FU
08 Ford F150 FX4-->Castrol 0W-40 w/FU
12 Ford Edge-X2 Limited & SE->PP 0W-20 w/FU


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#2174210 - 02/17/11 07:53 PM Re: Best oil for a Generac generator [Re: kdoss]
CompGUY Offline


Registered: 03/17/10
Posts: 31
Loc: Missouri Ozarks
I use GC and RT 10-30

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#2174259 - 02/17/11 08:50 PM Re: Best oil for a Generac generator [Re: kdoss]
dakota99 Offline


Registered: 09/27/09
Posts: 431
Loc: indiana
Mobil 1 0w40 would be an excellent choice. I plan on using it in mine after break in. As for shearing, i think it's just perfect. If it shears, it will still be in the 30 weight range, where a 30 to start with might end up a 20.

Use it longer though since it's synthetic to get good money from it. There's a UOA somewhere from i think it was a honda gx340 on 0w40, 312 hours and it was good.
_________________________
1999 Dodge Dakota
5.2L
PYB 5w30
145k Miles

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