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#4447923 - 07/02/17 11:16 PM 30 weight dino vs. 10w-30 synthetic for generator
MarkLTX Offline


Registered: 07/01/17
Posts: 2
Loc: Houston
I recently bought a generator with a 7 HP air-cooled engine (DuroStar DS4000S). The manual recommends using 10w-30 in temps up to about 80 degrees F and straight 30 weight above that. However, I'm sure that refers to conventional oil whereas I would like to use synthetic.

What viscosity synthetic would you guys recommend? I like the idea of a multi-grade oil, e.g. 10w-30, to get better flow at startup. Will a synthetic 10w-30 do the job in 95-100 degree weather that, apparently, a conventional 10w-30 can't? Well it perform as well as conventional straight 30 weight in 100 degree temps?

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#4447934 - 07/02/17 11:38 PM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
Reddy45 Online   shocked


Registered: 08/15/08
Posts: 2962
Loc: USA
An air cooled generator in Houston? Is it mostly for emergency power or for job site?

For emergency use - Stick with synthetic 10W30. As with any emergency equipment, you would need to run it occasionally to make sure the fuel doesn't go bad and to ensure it's ready when needed.

For jobsite - I would put something like Rotella SAE 30 grade or even 15W40. Something stout.

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#4447940 - 07/02/17 11:42 PM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
901Memphis Offline


Registered: 08/14/10
Posts: 12893
Loc: Northern Kentucky
10w30 synthetic will generally always be superior to an SAE 30
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#4447952 - 07/03/17 12:26 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
bmwtechguy Offline


Registered: 06/15/04
Posts: 2673
Loc: South Carolina
This is what I have been using for quite a few years. Equipment all runs like new. Amsoil Commercial 10W-30 Synthetic
Before it was available we used Amsoil SAE 30/10W-30 which was available only in gallons.


Edited by bmwtechguy (07/03/17 12:40 AM)

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#4447962 - 07/03/17 12:48 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: MarkLTX
I like the idea of a multi-grade oil, e.g. 10w-30, to get better flow at startup.


There will be NO "start-up flow issues" in Houston.

I use 15W-40 HDEO (Shell Rotella, Chevron Delo) in all air cooled engines.
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#4448015 - 07/03/17 06:19 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
Panzerman Offline


Registered: 12/16/06
Posts: 4203
Loc: Port Orange, Florida
I would go with a Straight 30HD or 15w40. You don't need the cold flow properties of a synthetic. You need extreme heat protection and burn off.
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#4448022 - 07/03/17 06:31 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
dave123 Offline


Registered: 01/13/09
Posts: 2313
Loc: wi
Amsoil ASE 30/10w30 or ASF 10w40 is what I would run.

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#4448052 - 07/03/17 07:47 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
beanoil Offline


Registered: 10/17/04
Posts: 2951
Loc: Midwest, Illinois
Straight 30 weight. No VI to shear, and will easily handle anything an air cooled small motor will do.
Delo and Rotella come to mind, Rural King sells Mobil in straight 30 weight.
Lube King, Harvest King at Farm and Home, Traveller at Tractor Supply.
Cold flow? Not where you are, and not in OPE.
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#4448103 - 07/03/17 08:36 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
Carbon12 Offline


Registered: 03/10/15
Posts: 198
Loc: MO
A typical PCMO 10w30 has an HTHS viscosity of about 3.1cP. I have occasionally seen HTHS values for SAE 30 around 3.6 cP. This is likely why the SAE 30 is recommended for the higher temps. In my opinion an oil with an HTHS of 3.1 is too thin for the heat you may encounter in summer where you are.

As a compromise I am running Rotella 10w30 synthetic blend in my generator (emergency power) since 10w30 HDEOs usually have an HTHS of 3.5. After I get a few more hours on it I plan to switch to a 0w40 synthetic for the 3.6 - 3.7 HTHS

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#4448108 - 07/03/17 08:44 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: Carbon12]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Originally Posted By: Carbon12
A typical PCMO 10w30 has an HTHS viscosity of about 3.1cP. I have occasionally seen HTHS values for SAE 30 around 3.6 cP. This is likely why the SAE 30 is recommended for the higher temps. In my opinion an oil with an HTHS of 3.1 is too thin for the heat you may encounter in summer where you are.

As a compromise I am running Rotella 10w30 synthetic blend in my generator (emergency power) since 10w30 HDEOs usually have an HTHS of 3.5. After I get a few more hours on it I plan to switch to a 0w40 synthetic for the 3.6 - 3.7 HTHS


I appreciate you citing specific reasons for your advice but this poster lives in Houston so there is zero advantage to a 0w40, right?
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#4448110 - 07/03/17 08:46 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
merconvvv Offline


Registered: 07/10/16
Posts: 682
Loc: il usa
I also have a similar question.
Synthetic 10w30 v conventional sae 30.
Which has better noack?
Sae 30 noack info i cannot find for say pyb quaker state mobil valvoline castrol etc.

Will a conventional sae 30 will have low noack like 5 or lower for sure ?
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#4448123 - 07/03/17 08:56 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
tig1 Offline


Registered: 01/03/09
Posts: 13655
Loc: Illinois
I have used M1 10-30 in all my OPE for many years, including my 5KW Powermate generator.
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M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
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#4448129 - 07/03/17 09:00 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: ArcticDriver]
Carbon12 Offline


Registered: 03/10/15
Posts: 198
Loc: MO
Originally Posted By: ArcticDriver
Originally Posted By: Carbon12
A typical PCMO 10w30 has an HTHS viscosity of about 3.1cP. I have occasionally seen HTHS values for SAE 30 around 3.6 cP. This is likely why the SAE 30 is recommended for the higher temps. In my opinion an oil with an HTHS of 3.1 is too thin for the heat you may encounter in summer where you are.

As a compromise I am running Rotella 10w30 synthetic blend in my generator (emergency power) since 10w30 HDEOs usually have an HTHS of 3.5. After I get a few more hours on it I plan to switch to a 0w40 synthetic for the 3.6 - 3.7 HTHS


I appreciate you citing specific reasons for your advice but this poster lives in Houston so there is zero advantage to a 0w40, right?


Right. I would say no need or advantage for 0w40 in Houston. I plan to switch to it since I may need my generator at 0 - 100 F. If I lived in a warm climate I would be confident in SAE 30.

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#4448169 - 07/03/17 09:45 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
SavagePatch Online   content


Registered: 05/06/15
Posts: 570
Loc: California
I like GC 0w30 for OPE.

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#4448190 - 07/03/17 10:16 AM Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX]
JimPghPA Offline


Registered: 08/22/09
Posts: 3859
Loc: Pittsburgh,PA U.S.A.
For the high temperatures you can see in Houston Mobil 15W-50 would be a great choice.
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