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Generac brand motor oil? #5379391 03/18/20 09:41 AM
Joined: Jun 2019
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Ricky_Samsonia Offline OP
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I have a Generac Gaurdian 17k portable with 200 hrs and been using M1 HM 10w30 Syn yr-round here in the deep south.
But would Generac Syn 10w30 be any better at all?
Or would a straight 30w be better for the high heat here?

Re: Generac brand motor oil? [Re: Ricky_Samsonia] #5379397 03/18/20 09:45 AM
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LotI Offline
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I would think the Mobil is one of the best choices for the price.

Many(most?) synthetic 10w-30 oils don’t use VII’s so they are a great choice. The base oil is what gives it a 10w rating. I don’t think I’ve ever seen a SAE30 synthetic because of this property of synthetics.


03 Honda Interceptor
11 Kawasaki KLR 650
12 Ford E450
19 Buick Regal TourX
Re: Generac brand motor oil? [Re: Ricky_Samsonia] #5379427 03/18/20 10:14 AM
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Dwight_Frye Offline
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I have a stationary Generac 17 kw generator that is hard wired to my house. The manual calls for 5W-30. Temps can get down into the 20's in the winter and 90's in the summer here although I have never had it kick on during the summer months other than as part of the self-testing program that is does. I use Castrol 5W-30 Magnatech full synthetic that I found on sale for about $17 for a jug.
What weight does your manual call for for a portable unit ?

Re: Generac brand motor oil? [Re: Ricky_Samsonia] #5379452 03/18/20 10:55 AM
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FT92 Offline
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have had a generac 5000 w portable for several years now...if I remember right the manual said to use 10 - 30 synthetic after yearly oil changes all is well

Re: Generac brand motor oil? [Re: Ricky_Samsonia] #5379458 03/18/20 10:57 AM
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PowerSurge Online Content
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Already answered your post in the other thread.


1993 Porsche 964, 2001 Ford SVT F-150 Lightning, 2004 Chevrolet Corvette, 2018 Toyota Tundra and a few others
America First
Re: Generac brand motor oil? [Re: Ricky_Samsonia] #5379514 03/18/20 12:06 PM
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benjy Offline
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typical group III fake synthetic 10-30 is a good choice, BUT real synthetic PAO + Ester oils advertised as a 30W meet the 10-30 spec WITHOUT any viscosity improvers, but since cost is about triple + its overkill as well it matters not

Re: Generac brand motor oil? [Re: Ricky_Samsonia] #5379592 03/18/20 02:01 PM
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Gokhan Offline
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Run SAE 30 C*-4, 15W-40 C*-4, 5W-40 C*-4, or 0W-40 CF & A3/B4 as I said in the other thread. 15W-40 and 5W-40 will decrease the efficiency a little, but they're good for reducing the wear.


2020 Toyota Prius Prime XLE plug-in hybrid, 2ZR-FXE engine, ~ 65 mpg on regular gasoline, ~ 5,000 mi
TGMO 0W-16 SN/RC Japan
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Re: Generac brand motor oil? [Re: Ricky_Samsonia] #5379764 03/18/20 06:04 PM
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tig1 Offline
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A friend is a Generac tech and he told me the instructor at the gen school advised using M1 5-30. He has a lot of customers that he services their Generac gens and he uses M1 5-30. Even though those generators are problem heavy, he has never had an issue with the internals of the engine.


2007 Ford Fusion 260,000 miles
M1 5-20HM
2017 Ford Fusion 93K
M1 0-20EP
10,000 mile OCIs on both engines
M1 ATF and M1 LV HP ATF
M1 10-30 in all OPE
MC filters

Re: Generac brand motor oil? [Re: Ricky_Samsonia] #5379786 03/18/20 06:40 PM
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mattwithcats Offline
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Shell Rotella T6 in either 5W-40 or 0W-40.

I use an oversize Wix 51516 oil filter...


2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Wix XP 51356 filter, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)
Re: Generac brand motor oil? [Re: Ricky_Samsonia] #5380366 03/19/20 12:52 PM
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DC_Stewart Offline
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I've had a 7500w Generac for about 10 years now and it always gets Mobil 1, 10-30. There is literally no visible engine wear.


DC Stewart
Milford Station
Nova Scotia, Canada

1981 VW Rabbit Pickup Turbodiesel
1956 Triumph TRW
Re: Generac brand motor oil? [Re: tig1] #5396424 04/07/20 12:52 PM
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Indy2door Offline
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I have a portable Generac generator, a standby Generac generator and a Generac powered Dixie Chopper. Never a problem with any of them.

Re: Generac brand motor oil? [Re: DC_Stewart] #5396552 04/07/20 03:18 PM
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tundraotto Offline
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Originally Posted by DC_Stewart
I've had a 7500w Generac for about 10 years now and it always gets Mobil 1, 10-30. There is literally no visible engine wear.


No argument on Mobil 1 10W-30 being a good oil - just a question on: what is "visible engine wear"?

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