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30 weight dino vs. 10w-30 synthetic for generator #4447923
07/02/17 11:16 PM
07/02/17 11:16 PM
Joined: Jul 2017
Posts: 2
Houston
MarkLTX Offline OP
MarkLTX  Offline OP
Joined: Jul 2017
Posts: 2
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?

Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4447934
07/02/17 11:38 PM
07/02/17 11:38 PM
Joined: Aug 2008
Posts: 3,149
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,149
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.

Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4447940
07/02/17 11:42 PM
07/02/17 11:42 PM
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
10w30 synthetic will generally always be superior to an SAE 30


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4447952
07/03/17 12:26 AM
07/03/17 12:26 AM
Joined: Jun 2004
Posts: 2,682
South Carolina
bmwtechguy Offline
bmwtechguy  Offline
Joined: Jun 2004
Posts: 2,682
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.

Last edited by bmwtechguy; 07/03/17 12:40 AM.
Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4447962
07/03/17 12:48 AM
07/03/17 12:48 AM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4448015
07/03/17 06:19 AM
07/03/17 06:19 AM
Joined: Dec 2006
Posts: 4,219
Port Orange, Florida
Panzerman Offline
Panzerman  Offline
Joined: Dec 2006
Posts: 4,219
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.



2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4448022
07/03/17 06:31 AM
07/03/17 06:31 AM
Joined: Jan 2009
Posts: 2,376
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,376
wi
Amsoil ASE 30/10w30 or ASF 10w40 is what I would run.

Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4448052
07/03/17 07:47 AM
07/03/17 07:47 AM
Joined: Oct 2004
Posts: 3,075
Midwest, Illinois
beanoil Offline
beanoil  Offline
Joined: Oct 2004
Posts: 3,075
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.


beanoil: Tough under heat, real dirty afterwards.
Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4448103
07/03/17 08:36 AM
07/03/17 08:36 AM
Joined: Mar 2015
Posts: 206
MO
Carbon12 Offline
Carbon12  Offline
Joined: Mar 2015
Posts: 206
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

Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: Carbon12] #4448108
07/03/17 08:44 AM
07/03/17 08:44 AM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
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?


Multiple Diesel and Gasoline vehicles
Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4448110
07/03/17 08:46 AM
07/03/17 08:46 AM
Joined: Jul 2016
Posts: 682
il usa
merconvvv Offline
merconvvv  Offline
Joined: Jul 2016
Posts: 682
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 ?


1988 Mazda RX7 na PP 10w30 Noack 4.7
1994 Chrysler Concorde 3.3
1999 Ford Expedition 4.6 QSUD 10W30 NOACK 5.0
Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4448123
07/03/17 08:56 AM
07/03/17 08:56 AM
Joined: Jan 2009
Posts: 13,831
Illinois
tig1 Online content
tig1  Online Content
Joined: Jan 2009
Posts: 13,831
Illinois
I have used M1 10-30 in all my OPE for many years, including my 5KW Powermate generator.


2007 Ford Fusion 232,000 miles
M1 0-20 EP
2017 Ford Fusion 55K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters

Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: ArcticDriver] #4448129
07/03/17 09:00 AM
07/03/17 09:00 AM
Joined: Mar 2015
Posts: 206
MO
Carbon12 Offline
Carbon12  Offline
Joined: Mar 2015
Posts: 206
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.

Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4448169
07/03/17 09:45 AM
07/03/17 09:45 AM
Joined: May 2015
Posts: 640
California
SavagePatch Offline
SavagePatch  Offline
Joined: May 2015
Posts: 640
California
I like GC 0w30 for OPE.

Re: 30 weight dino vs. 10w-30 synthetic for generator [Re: MarkLTX] #4448190
07/03/17 10:16 AM
07/03/17 10:16 AM
Joined: Aug 2009
Posts: 3,899
Pittsburgh,PA U.S.A.
JimPghPA Online content
JimPghPA  Online Content
Joined: Aug 2009
Posts: 3,899
Pittsburgh,PA U.S.A.
For the high temperatures you can see in Houston Mobil 15W-50 would be a great choice.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

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