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#4472585 - 07/28/17 12:15 AM 1982 onan 4.0 genset -Synthetic Or hdeo ?
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: AZ
I drained the black 30 wt ( assuming) and refiled with supertech 15w40.

Since this is air cooled, should i stay with. 15w40 or go to a full synthetic 10w30 ?

I'm in az,i do personally see us running the generator in 80-100 weather and also cold ( 30 is coldest for us )
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#4472614 - 07/28/17 02:44 AM Re: 1982 onan 4.0 genset -Synthetic Or hdeo ? [Re: leroyd92]
AMC Offline


Registered: 10/17/10
Posts: 893
Loc: South Eastern, CT
I would stick with HDEO, whether synthetic or not. If you look at the additive package, volatility and TBN of HDEO compared to any PCMO; HDEO pretty much blows everything else away, especially with the additives.

For your machine and climate, I would recommend an HDEO 10w-30. Wal-Mart carries Rotella and Delo HDEO 10w-30 for a good price. That should cover your temp range and give good protection. Synthetic 5w-40 HDEO would work very well also. 15w-40 might start off a bit thick for a machine that doesn't get a lot of use and the temp can get to 30F degrees.
_________________________
11 Chevy Silverado - PP 5w-30
10 Ford Focus - QSAD 5w-20
14 Yamaha Super Tenere - Delo 15w-40

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#4472827 - 07/28/17 09:12 AM Re: 1982 onan 4.0 genset -Synthetic Or hdeo ? [Re: leroyd92]
Linctex Offline


Registered: 12/31/16
Posts: 6160
Loc: Waco, TX
I'd stick with 15W-40

Is this Onan 1800 RPM or 3600 RPM?

If it's 3600 RPM, it will last forever.
If it's 1800 RPM, it will last forever & ever & ever & ever & ever.....
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4472885 - 07/28/17 09:51 AM Re: 1982 onan 4.0 genset -Synthetic Or hdeo ? [Re: leroyd92]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1407
Loc: Jacksonville, FL
I think you're right on the money with the ST 15w40 you already have installed in the engine. Robust add pack at a value price. I wouldn't change a thing.
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P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander

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#4472948 - 07/28/17 11:05 AM Re: 1982 onan 4.0 genset -Synthetic Or hdeo ? [Re: leroyd92]
bubbatime Offline


Registered: 03/18/08
Posts: 5627
Loc: South Florida
15W40 minimum
20W50 for any long stretches of use (several days of use)
Absolutely no xW30 weight oils

Originally Posted By: AMC
For your machine and climate, I would recommend an HDEO 10w-30.


No. The guy lives in Arizona. 15W40 minimum for his engine/climate. The SuperTech 15W40 he chose is a great choice.
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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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#4472975 - 07/28/17 11:33 AM Re: 1982 onan 4.0 genset -Synthetic Or hdeo ? [Re: leroyd92]
pkunk Offline


Registered: 03/19/11
Posts: 257
Loc: NM, USA
15-40 is the lube recommended by Onan. I use 15-40 in mine anywhere from S. AZ to the mtns of NM where I live and never had a problem.
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#4475010 - 07/30/17 09:17 PM Re: 1982 onan 4.0 genset -Synthetic Or hdeo ? [Re: pkunk]
AMC Offline


Registered: 10/17/10
Posts: 893
Loc: South Eastern, CT
Originally Posted By: pkunk
15-40 is the lube recommended by Onan. I use 15-40 in mine anywhere from S. AZ to the mtns of NM where I live and never had a problem.


I was assuming 10w-30 was the factory recommended weight and 15w-40 was just everyone's suggestion to go a little thicker because it is an old engine.

I will stick with the first part of my post though, HDEO is the way to go. 10w-40 PCMO is going to have a lot less additives.
_________________________
11 Chevy Silverado - PP 5w-30
10 Ford Focus - QSAD 5w-20
14 Yamaha Super Tenere - Delo 15w-40

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