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Oil recommendations for HD portable generator #5336758 01/30/20 08:22 PM
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NWGuy Offline OP
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Hi all, new to the forum as a registered user, but I have been driving down the oil nerd rabbit hole of valuable information on here for at least a year, and I'm hooked! Thanks to all the contributors here for their great advice and frankly civilized behavior compared to many forums out there.

I recently lucked out purchasing an 8kw (running) portable generator from 1991 with a US assembled Vanguard 16hp V twin with force feed lubrication and an external oil filter. Some farmer ran it for 45 minutes when he bought it, changed the oil, and stashed it in his basement for 18 years under a tarp!

I have taken this generator to it's knees over the course of a 4 day on and off power outage a couple weeks ago running water pumps, heat pumps, and even the dryer. Started out with synthetic 5w30, but I want something that will stand up to the high oil temps I will see as this thing will sometimes run for a couple days straight. It is set up to run on propane as well, and I am having a 120 gallon tank brought in just for the generator, so fuel dillution shouldn't be an issue (I don't think). The generator is in a kind of lean-to shanty against the side of the house, it has lots of airflow, and the exhaust is ducted outside of it, but it still gets to be 70 plus degrees in there when the generator is running even when it is below freezing outside. My issue is I may need to start this thing and run in super cold temps, I live in NW Washington, but I could see temps approaching 0°F, but then once it's up and running, it will be toasty warm, and powering the whole house, potentially for a couple days at a time. Not quite sure where to go. My thought is to run a decent 5w40 synthetic like T6, or Valvoline PBE, which I could probably have on hand for my truck (6.7 Cummins). I currently run Valvoline PB 15w40 conventional in my truck as I only do 5k OCI about annually, but I may start blending in one jug out of three of PBE 5w40 synthetic to get a better winter rating, so I could have both on hand. I can't justify running different oil in the cold months (in the truck or the generator really) as I will only be doing annual oil changes unless I rack up a ton of hours during an exceedingly long power outage. I'd love to hear some opinions of 5w40 synthetic vs 15w40 conventional (or something else that might work better) in this application considering how hot the oil will get, and how many hours I can stretch out the OCI on this thing since it has a nice spin on oil filter. I probably ran for a total of 50 hours in 4 days this last go, but ya never know, it would not be impossible to wind up needing to run for over 100 hours straight. Thanks! I have attached the Vanguard oil recommendations as well.

Screenshot_20200130-165228__01.jpgScreenshot_20200121-225824__01__01.jpg
Re: Oil recommendations for HD portable generator [Re: NWGuy] #5336772 01/30/20 08:34 PM
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JohnnyJohnson Offline
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I think it could make a great deal of difference weather you live on the wet side or cold side of Vashington.


2004 Corolla 139577
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 77060
Out: T6 5W-40 XG9100 73909
In: Rotella Dino PH9100 11-3-19
Re: Oil recommendations for HD portable generator [Re: NWGuy] #5336818 01/30/20 09:21 PM
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walterjay Offline
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5W-30 Synthetic. Any brand.

Re: Oil recommendations for HD portable generator [Re: NWGuy] #5336842 01/30/20 10:03 PM
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eljefino Offline
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Electric start or pull cord?

The first five seconds of running are where you'll get most of your wear, as this thing flies up to 3600 RPM. Your 5w40 synthetic sounds great. Not sure why you're blending it in your truck, I'd run the 5w40 year round in it also.

Re: Oil recommendations for HD portable generator [Re: NWGuy] #5336847 01/30/20 10:09 PM
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bubbatime Offline
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10W30 Delo or Rotella
Mobil high mileage synthetic 10W30

Is what I would use for your location and engine, assuming its a full pressure lube engine. And you'll most likely use it in the winter.

Re: Oil recommendations for HD portable generator [Re: NWGuy] #5336849 01/30/20 10:11 PM
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umungus1122 Offline
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10w-30 synthetic


'95 Chevy 1/2t 305 208k -NexGen Maxlife 5w-30, Wix filter
'04 Crown Vic 95k Maxlife full syn 5w-20
Re: Oil recommendations for HD portable generator [Re: NWGuy] #5336876 01/30/20 10:37 PM
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mattwithcats Offline
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Wix 51516 oil filter
https://www.rockauto.com/en/parts/wix,51516,oil+filter,5340

Shell Rotella T6 in either 5W-40 or 0W-40..
https://rotella.shell.com/en_us/products/full-synthetic-and-blend-oil/t6-full-synthetic.html

Make sure the existing oil filter has 3/4-16 threads...


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: Oil recommendations for HD portable generator [Re: NWGuy] #5336904 01/30/20 11:24 PM
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CT8 Online Content
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Use a HDEO 5W-40. I use the 5w-40 in every ope and diesel engine I own because of freezing weather starts. Otherwise i would run 15W-40


2015 F150 2.7
2018 F350 6.2
Re: Oil recommendations for HD portable generator [Re: NWGuy] #5336914 01/30/20 11:38 PM
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UncleDave Offline
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I run most of my gensets on M1 0W-40 and in the case of my diesel 8000 had no problem up to 300 hours on a tiny sump.

The UOAs looked like it had never even been run, they are posted here.

UD


Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: Oil recommendations for HD portable generator [Re: NWGuy] #5336945 01/31/20 12:50 AM
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Mobil 1 0W/30 AFE

Re: Oil recommendations for HD portable generator [Re: CT8] #5336988 01/31/20 03:53 AM
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Kamele0N Offline
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Originally Posted by CT8
Use a HDEO 5W-40. I use the 5w-40 in every ope and diesel engine I own because of freezing weather starts. Otherwise i would run 15W-40

This! Use sae40......HDEO....or EU PCMO....stay away from your ILSAC (fuel conserving) oils...

You are chasing/want oil with a higher HTHS


2008 Toyota Yaris 1ND-TV 1.4 D4-D Tech9 5W30 C3 VW 504/507
1997 Toyota Landcruiser KZJ95 3.0 TD Elf Evolution NF900 5W40
Re: Oil recommendations for HD portable generator [Re: eljefino] #5336995 01/31/20 04:57 AM
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NWGuy Offline OP
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It is electric start. I was thinking of blending in one jug 5w40 synthetic PBE to get some of the cold start benefits while still using two parts (jugs) of the 15w40 PB that I stocked up on during a deal for $8 a gallon 😏

Re: Oil recommendations for HD portable generator [Re: mattwithcats] #5336996 01/31/20 05:01 AM
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NWGuy Offline OP
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It uses the Briggs & Stratton 491056 oil filter currently. Same filter as my lawnmower with a 20hp Briggs and Stratton. Cross reference chart shows Wix 51348 or 51348xp would work, which is the same oil filter I was using on my Tacoma when I had it, funny coincidence😄.

Re: Oil recommendations for HD portable generator [Re: NWGuy] #5337047 01/31/20 07:12 AM
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I am currently running Rotella T6 5w-40 in both of my generators because they could theoretically be called into service anywhere from 0 - 100 degrees F. 10W-30 Mobil1 High Mileage with its 3.5 HTHS is a good alternative. A Fram 3614 filter should work for you also. I use the TG3614 on my Briggs V-Twin.


'01 Volvo V70XC, 252k, 5W-30 M1 EP
'16 Accord, 50k, 0W-20 M1 EP
Re: Oil recommendations for HD portable generator [Re: NWGuy] #5337089 01/31/20 08:44 AM
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ARCOgraphite Offline
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The suggestion of "run any 5w30 synthetic" is a "Fool's Choice"


I've had top synthetics shear to water in an hour. SO I went on a quest.

Why #1 they are not synthetic - regardless of what the bottles says ( see: NAD - BBB ruling)

#2 They are not developed for air cooled ODPE - but for fuel economy and converter life on pressure lubed engines

Seeing I may have to Start the thing in 10 deg F weather,
I ended up with Valvoline Racing 10W30 Synthetic with a TBSP of LUBRIMOLY.

That one quart - Its still in there 12 year later. Looks good runs great.

NO warm Knocking like PCMO synthetics

I do have to change that (!)


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
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