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Generator change interval #4813247
07/13/18 02:40 PM
07/13/18 02:40 PM
Joined: Jan 2006
Posts: 1,116
Ohio
Dave Sherman Offline OP
Dave Sherman  Offline OP
Joined: Jan 2006
Posts: 1,116
Ohio
Owner's manual for Predator 4000 generator calls for oil changes every 20 hours. Seems a little excessive even by small engine standards, and I run Rotella T5 10W-30 in it. I figured more like 100 hours or annually, and I have an hour meter installed on it. It's barely changed color in the 13 hours on it so far.


2015 Honda Pilot EX AWD Valvoline 0W-20 Bosch filter
1977 MG Midget Valvoline VR-1 20W-50 Bosch Filter
Re: Generator change interval [Re: Dave Sherman] #4813269
07/13/18 02:57 PM
07/13/18 02:57 PM
Joined: Jul 2017
Posts: 26
Sacramento, Ca.
928 Offline
928  Offline
Joined: Jul 2017
Posts: 26
Sacramento, Ca.
Oil is cheaper than a good burger- change it . It may seem to be excessive but remember in a small engine it does double duty as a lube & coolant.

Re: Generator change interval [Re: Dave Sherman] #4813295
07/13/18 03:16 PM
07/13/18 03:16 PM
Joined: Mar 2004
Posts: 20,743
Upstate NY
Donald Online content
Donald  Online Content
Joined: Mar 2004
Posts: 20,743
Upstate NY
If no filter, follow manual.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Generator change interval [Re: Dave Sherman] #4813297
07/13/18 03:17 PM
07/13/18 03:17 PM
Joined: Apr 2009
Posts: 287
Maryland
walterjay Offline
walterjay  Offline
Joined: Apr 2009
Posts: 287
Maryland
Based on my experience with generators I would do every 50 hours.
I have a Makita generator that I bought 18 years ago. Used mainly on dirty construction sites. I change it about every 40-80 hours and runs like new. Used 5-30 dino oil in it for years and recently switched to synthetic.

Re: Generator change interval [Re: Dave Sherman] #4813339
07/13/18 03:58 PM
07/13/18 03:58 PM
Joined: Sep 2004
Posts: 7,514
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,514
Marshfield , MA
Thank you for reminding me. I have the same engine on a snowblower. I ran it for 5hrs and changed the oil. I was expecting shiny bits in the oil. Didn't see any specks at all. Barely used this yr, but it hasn't been changed in 3yrs. Great little engine IMO.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Generator change interval [Re: Dave Sherman] #4813402
07/13/18 05:47 PM
07/13/18 05:47 PM
Joined: Mar 2011
Posts: 1,806
CA
spackard Offline
spackard  Offline
Joined: Mar 2011
Posts: 1,806
CA
I think 1st oil change is after 20 hours. After that, 100 hours is reasonable.
If it's sitting in my garage doing standby use only, I keep it in there for 5 years.

Re: Generator change interval [Re: Dave Sherman] #4813406
07/13/18 05:58 PM
07/13/18 05:58 PM
Joined: Aug 2008
Posts: 339
NJ
Padawan Offline
Padawan  Offline
Joined: Aug 2008
Posts: 339
NJ
The manual definitely calls for 20 hour intervals, and that's what I'd follow. The capacity is only 0.6 quarts, so it's quite a small investment, especially if you're buying 5 quart or gallon jugs.

Re: Generator change interval [Re: Dave Sherman] #4813500
07/13/18 08:32 PM
07/13/18 08:32 PM
Joined: Jul 2015
Posts: 477
Pennsylvania
Astro_Guy Offline
Astro_Guy  Offline
Joined: Jul 2015
Posts: 477
Pennsylvania
That seems excessive. 20 hours would imply daily oil changes during an extended outage. 50 hours seems more reasonable.

Re: Generator change interval [Re: Dave Sherman] #4813593
07/13/18 10:48 PM
07/13/18 10:48 PM
Joined: Mar 2008
Posts: 5,839
South Florida
bubbatime Offline
bubbatime  Offline
Joined: Mar 2008
Posts: 5,839
South Florida
The basic rule of thumb for small engine generators, is that if it does not have an oil filter, you change every 50 hours. If it has an oil filter you can go 100 hours. Some of the more expensive, commercial style generators will want an oil change every 200 hours.

I agree, 20 hours is excessive. To me, that is put in the manual because a lot of people blow up their engines (due to lack of oil), so perhaps that's Harbor Freights way to get out of warranty claims. "Did you change the oil after 20 hours?" No? Sorry, warranty declined.

So if it were mine, I would just go with the standard recommendation above for every other brand. Change it every 50 hours (no filter) or every 100 hours (with filter).

Of course, the standard recommendation to check the oil at every fuel fill up still applies.


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


Re: Generator change interval [Re: Dave Sherman] #4813634
07/14/18 12:32 AM
07/14/18 12:32 AM
Joined: May 2007
Posts: 559
Ky
CaspianM Offline
CaspianM  Offline
Joined: May 2007
Posts: 559
Ky
As a general rule, whatever your manual says is the one to follow.
That is 20 hours of full throttle operation. There is a reason every small engine recommends 20 hrs specially if there is no filter. Keep your air cleaner clean as well.
I am not in longer and longer oil change interval camp.
I have not exceeded 30 hrs in occasions.


14 Dodge Durango
15 Yamaha FZ09
13 Lexus CT200h(M1 0W-20)
15 Yamaha Bolt (FF)
08 Suzuki B-King M1(4T)
10 Xterra SE
06 VTX-1300C
05 Honda 919


Re: Generator change interval [Re: CaspianM] #4813664
07/14/18 03:01 AM
07/14/18 03:01 AM
Joined: Mar 2008
Posts: 5,839
South Florida
bubbatime Offline
bubbatime  Offline
Joined: Mar 2008
Posts: 5,839
South Florida
Originally Posted By: CaspianM
There is a reason every small engine recommends 20 hrs specially if there is no filter.


Which small engines recommend changing the oil every 20 hours?


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


Re: Generator change interval [Re: Dave Sherman] #4813882
07/14/18 12:47 PM
07/14/18 12:47 PM
Joined: May 2007
Posts: 559
Ky
CaspianM Offline
CaspianM  Offline
Joined: May 2007
Posts: 559
Ky
After looking up my manuals, most of them recommend 50 hrs under normal condition and 25 hrs under severe after break-in which requires 5 hr oil change. My Subaru recommended 20 hrs after initial break-in.
Sever condition is defined as hi temp and/or dusty condition. So it is up to the owner to decide.
Perhaps 30 hours would be a more realistic recommendation imo than 20 hrs.


14 Dodge Durango
15 Yamaha FZ09
13 Lexus CT200h(M1 0W-20)
15 Yamaha Bolt (FF)
08 Suzuki B-King M1(4T)
10 Xterra SE
06 VTX-1300C
05 Honda 919


Re: Generator change interval [Re: bubbatime] #4813888
07/14/18 12:53 PM
07/14/18 12:53 PM
Joined: Aug 2008
Posts: 339
NJ
Padawan Offline
Padawan  Offline
Joined: Aug 2008
Posts: 339
NJ
Originally Posted By: bubbatime
Which small engines recommend changing the oil every 20 hours?


The manual for the original poster's Predator generator, for one.

Re: Generator change interval [Re: Dave Sherman] #4813909
07/14/18 01:39 PM
07/14/18 01:39 PM
Joined: Nov 2003
Posts: 3,790
Cape Cod, MA
RF Overlord Offline
RF Overlord  Offline
Joined: Nov 2003
Posts: 3,790
Cape Cod, MA
You guys just made me look at the manual for my Subaru/Robin RG4300iS generator and it states the initial change should be at 20 hrs, but every 100 hrs after that. It does not have a filter.

I did the initial change at 7.5 hrs and found no glitter. Now has 50 hrs and I've changed it twice since then and each time the oil looks almost new coming out.

Last edited by RF Overlord; 07/14/18 01:44 PM.

Supercharged '03 Mercury Marauder - Trilogy Motorsports #61
PP 5W-30 / MC FL820S

'04 Grand Marquis LS Limited Edition - daily driver

'00 Grand Marquis GS - bad frame/future to be determined
Re: Generator change interval [Re: CaspianM] #4813914
07/14/18 01:48 PM
07/14/18 01:48 PM
Joined: May 2015
Posts: 263
St. Louis, MO
Lawn_Care Offline
Lawn_Care  Offline
Joined: May 2015
Posts: 263
St. Louis, MO
Originally Posted By: CaspianM
After looking up my manuals, most of them recommend 50 hrs under normal condition and 25 hrs under severe after break-in which requires 5 hr oil change.


This ^

Common practice for countless small engines over the years.

Last edited by Lawn_Care; 07/14/18 01:49 PM.

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