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#4509176 - 09/06/17 03:31 PM Generac portable generator oil?
lawnman Offline


Registered: 05/27/13
Posts: 36
Loc: FL
Ok my turn! Great advice on the honda generator earlier. Looking for recommendations on my brand new Generac. Portable unit. 8000 watts. Looks like they recommend 30 wt. Or 10/30 in lower temps. Here in Florida in summer means hot. Should have the machine up and running Friday and going to change factory fill at 5 hours. I was kinda thinking a multi grade 10/30 or 15/40 rotella. What ya think and wish us luck from irma!

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#4509180 - 09/06/17 03:36 PM Re: Generac portable generator oil? [Re: lawnman]
SatinSilver Offline


Registered: 01/24/08
Posts: 10342
Loc: OH
Either 30 wt or 10w30. Probably the latter since a little easier to find. Stay safe down there man. Prayers are with you brother.

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#4509183 - 09/06/17 03:39 PM Re: Generac portable generator oil? [Re: lawnman]
dlundblad Offline


Registered: 09/30/13
Posts: 10214
Loc: Indiana
With the warranty, I'd use what the OM says. Does anyone still make a gas rated 30w HDEO?

M1 10w30 HM gets my vote here.. or some gas rated T5 if you can find it.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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#4509189 - 09/06/17 03:47 PM Re: Generac portable generator oil? [Re: lawnman]
LeakySeals Offline


Registered: 02/18/11
Posts: 6625
Loc: Hudson, NH
Our service guy performs a yearly change with M1 10w30. Comes out so clean it seems like a waste. He said he uses 10w30 because its not so thick it robs power and hard to start. I'm sure you could use thicker or thinner if you wanted. Mine has a delay in ignition where the starter turns the engine over for approx 15 secs, enough to get oil on parts before it actually starts for its weekly auto test.
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 152k ST HM 10w30

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#4509193 - 09/06/17 03:48 PM Re: Generac portable generator oil? [Re: lawnman]
andyd Offline


Registered: 09/25/04
Posts: 7297
Loc: Marshfield , MA
If the unit has an electric starter, I would use 15W40.
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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#4509202 - 09/06/17 04:00 PM Re: Generac portable generator oil? [Re: LeakySeals]
SatinSilver Offline


Registered: 01/24/08
Posts: 10342
Loc: OH
Originally Posted By: LeakySeals
Comes out so clean it seems like a waste.


I know many that would use it in one of their cars like your Maxima.

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#4509224 - 09/06/17 04:22 PM Re: Generac portable generator oil? [Re: lawnman]
tig1 Offline


Registered: 01/03/09
Posts: 13726
Loc: Illinois
A friend was a Gererac tech for several years. In the Generac school his instructors rec. M1 5-10-30. I use M1 10-30 in my Subaru powered 5 KW gen. It actually is hotter here in Illinois than Florida in the summer.


Edited by tig1 (09/06/17 04:23 PM)
_________________________
2007 Ford Fusion 228,000 miles
M1 0-20 EP
2017 Ford Fusion 52K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4509234 - 09/06/17 04:33 PM Re: Generac portable generator oil? [Re: lawnman]
bubbatime Offline


Registered: 03/18/08
Posts: 5723
Loc: South Florida
Former small engine tech here.

Do you remember the 2004 FL hurricane season? 4 storms back to back. Millions without power for 30-40 days. It was miserable.

And people were slap blowing up their free FEMA generators within DAYS!! (yes the govt bought you a generator, for free, if you asked for one)

You REALLY need to stay on top of the oil level. You have to check it AT EVERY FILL UP. You also need to change the oil every two days. Its a severe duty cycle, and these small engines will burn through oil at a very rapid pace, ESPECIALLY the conventional multi-weights.

After two days of continuous use, the oil gets really fuel diluted, thins some more, which causes consumption, and before you know it you are dangerously low or blowing up your engine.

30 weight oils are MARGINAL, in a generator, in Florida. Period. If you are the less than 10% of folks that will religiously check your oil level, and religiously change your oil every 2 days, then yes, 30 weight will be fine for you.

My standard recommendation for this scenario is 15W40 minimum. 20W50 also a very appropriate and excellent recommendation, contrary to what the northerns and Canadians on this board would tell you. SAE40 is also IDEAL. Autozone and Advance usually carry it in a store brand.

Just look at Briggs & Stratton oil recommendations for severe duty (your engine is made by Briggs and Stratton). They recommend 20W50 in severe duty applications, when for years they never did, only recommending 30 weight. Wonder why? Too many warranty claims and blown engines.

A thicker oil in this application gives you a lot more margin for error should you get lazy and not keep your oil level up.


Briggs oil chart


And from their website:
-For continuous-use, such as commercial lawn cutting or pressure washing, use Vanguard 15W-50 Oil (temperatures from 20F to 130F).

_________________________
17 Chrysler Pacifica Mobil 1 5W30
13 Yamaha XT250 Valv MC 10W40
12 Suzuki S40 Rotella 15W40
10 Acura TSX 2.4 PZL Plat 5W30
06 GMC Sierra Nextgen 10W30



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#4509246 - 09/06/17 04:45 PM Re: Generac portable generator oil? [Re: bubbatime]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: bubbatime

My standard recommendation for this scenario is 15W-40 minimum.


Same here. I have over 20 pieces of air-cooled OPE, and run 15W-40 in all of it. Some gets worked so hard, the exhaust system is a nice red glow at night. Run 15W-40 and your engine will be protected.

Ehhh... I don't check the oil EVERY fill-up
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4509264 - 09/06/17 04:59 PM Re: Generac portable generator oil? [Re: Linctex]
dlundblad Offline


Registered: 09/30/13
Posts: 10214
Loc: Indiana
Originally Posted By: Linctex
Ehhh... I don't check the oil EVERY fill-up


Go sit in timeout and think about what you just said.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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#4509270 - 09/06/17 05:04 PM Re: Generac portable generator oil? [Re: lawnman]
Panzerman Offline


Registered: 12/16/06
Posts: 4215
Loc: Port Orange, Florida
I have to agree with using a thick oil like 20w50 or at least a HD oil like 15w40.
My son had my Honda industrial generator for Hurricane Mathew. It never used oil when we took it camping, running all night with 10w30 but when you start running them 24 hours for 5-7 days they use the oil. When I went to change it, it was tar black and had about 6 ounces of oil in it.
Apparently the low oil sensor wasn't working. So lesson learned, check oil, don't be surprised if it didn't use oil but now does running that many hours non- stop. Didn't lose the engine but probably didn't do it any favors.
_________________________

2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack

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#4509292 - 09/06/17 05:21 PM Re: Generac portable generator oil? [Re: lawnman]
Donald Offline


Registered: 03/21/04
Posts: 20569
Loc: Upstate NY
30 or 10W30.
_________________________
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)


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#4509321 - 09/06/17 05:51 PM Re: Generac portable generator oil? [Re: Panzerman]
tig1 Offline


Registered: 01/03/09
Posts: 13726
Loc: Illinois
Originally Posted By: Panzerman
I have to agree with using a thick oil like 20w50 or at least a HD oil like 15w40.
My son had my Honda industrial generator for Hurricane Mathew. It never used oil when we took it camping, running all night with 10w30 but when you start running them 24 hours for 5-7 days they use the oil. When I went to change it, it was tar black and had about 6 ounces of oil in it.
Apparently the low oil sensor wasn't working. So lesson learned, check oil, don't be surprised if it didn't use oil but now does running that many hours non- stop. Didn't lose the engine but probably didn't do it any favors.



What 10-30 did you use. Also when run for days on in, the oil level should be checked every 6-8 hours, and changed every 50 hrs. Never go 5-7 days. Poor maintenance.


Edited by tig1 (09/06/17 05:54 PM)
_________________________
2007 Ford Fusion 228,000 miles
M1 0-20 EP
2017 Ford Fusion 52K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4509346 - 09/06/17 06:19 PM Re: Generac portable generator oil? [Re: lawnman]
mattwithcats Offline


Registered: 06/13/13
Posts: 1680
Loc: Virginia
Look in the "Product Rebates, Sales and Promotions" section.
https://bobistheoilguy.com/forums/ubbthreads.php/forums/33/1/Product_Rebates,_Sales_and_Pro

Any full synthetic 10W-30 will work.

I see -
O'Reilly Auto, Havoline DS,
Advanced Auto Parts, Quaker State Ultra Deluxe,
Rural King full Synthetic,
And a few jugs may still be around, the 2.5 gallons Shell Rotella T5,
_________________________
2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Purolator Synthetic PSL 14610, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)

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#4509351 - 09/06/17 06:25 PM Re: Generac portable generator oil? [Re: lawnman]
NormanBuntz Offline


Registered: 07/27/13
Posts: 2171
Loc: Outer Banks, NC
I assume your Generac has a Generac engine. As an owner of the twin cylinder Generac GT-990 motor on a 16kw standby unit for the past 11 years, I can talk from my experience only. Nix on the 30w or any conventional multigrade. Mine calls for 5w-30 and I run QS Ultimate synthetic. I change mine at 25-30 hour intervals. The used oil always looks clean and clear, but the engines can be hard on oil, especially if run in a hot climate, as previous poster said. Just don't make the mistake of using a conventional oil.
_________________________
2017 Honda Odyssey SE, 14K
2013 Honda Accord LX, 58K
2007 Honda Ridgeline RTS, 86K
2007 Infiniti M35, 105K

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