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Briggs and Stratton desludging #4806003
07/05/18 02:46 PM
07/05/18 02:46 PM
Joined: Jul 2014
Posts: 383
Ceciltucky Maryland
Oldtom Offline OP
Oldtom  Offline OP

Joined: Jul 2014
Posts: 383
Ceciltucky Maryland
Bought a 22 inch MTD mower off Craigslist for dirt cheap. Engine is 3.75 HP Briggs. Foam air filter element was missing and the oil looked like black sludge. Installed a new air filter, new plug, and filled with some 5w 30 PYB I had lying around. The mower runs very well but is probably sludged inside. I want to do two more oil changes at 4 hours each to desludge the engine and remove any dirt from the missing air filter. Which is the better cleaning oil, Supertech 30 WT HD, Supertech 10w30, or Supertech 15w 40?

Thank you in advance for any advice.

Re: Briggs and Stratton desludging [Re: Oldtom] #4806006
07/05/18 02:52 PM
07/05/18 02:52 PM
Joined: Mar 2010
Posts: 654
NY
mx5miata Offline
mx5miata  Offline

Joined: Mar 2010
Posts: 654
NY
I'd go with 30w HD


NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter
Re: Briggs and Stratton desludging [Re: Oldtom] #4806021
07/05/18 03:10 PM
07/05/18 03:10 PM
Joined: Nov 2006
Posts: 21,017
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,017
MA, Mittelfranken.de
I would drain the oil and fill it with Kerosene, let it sit for a couple of days then drain and refill with HDEO 5w40.


ASE L1, Master. Deutsch Meisterbrief.
Re: Briggs and Stratton desludging [Re: Trav] #4806050
07/05/18 04:02 PM
07/05/18 04:02 PM
Joined: Mar 2004
Posts: 21,635
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 21,635
Upstate NY
Originally Posted By: Trav
I would drain the oil and fill it with Kerosene, let it sit for a couple of days then drain and refill with HDEO 5w40.


I would pull the plug and give the starter a few pulls every time you walk by. Maybe squirt some kerosene down the spark plug hole each evening.

Mix it up.

You have no idea if it is sluged or not. Dirt/dust into the engine will blacken the oil and cause wear but may not cause sludge. Sludge is mainly due to ignoring oil changes.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Briggs and Stratton desludging [Re: Donald] #4806052
07/05/18 04:05 PM
07/05/18 04:05 PM
Joined: Nov 2006
Posts: 21,017
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,017
MA, Mittelfranken.de
Its a lawnmower, fill with Kerosene and tip the engine to fill the cylinder from behind with the plug in, it will fill it and loosen all sorts of garbage. Just pull the plug, clean/replace it and thoroughly drain the crank case after it sat a while.


ASE L1, Master. Deutsch Meisterbrief.
Re: Briggs and Stratton desludging [Re: Oldtom] #4806066
07/05/18 04:30 PM
07/05/18 04:30 PM
Joined: May 2015
Posts: 264
St. Louis, MO
Lawn_Care Offline
Lawn_Care  Offline

Joined: May 2015
Posts: 264
St. Louis, MO
SuperTech 15w40 is perfect for a small air cooled engine like that, and a few short OCI's (3-4 hours each) should have it cleaned out in no time. Not trying to start a war, but a couple oz. of MMO or Seafoam will help speed the process.


True victory does not come from defeating an enemy. True victory comes from giving love and changing an enemies heart.
Re: Briggs and Stratton desludging [Re: Oldtom] #4806163
07/05/18 06:34 PM
07/05/18 06:34 PM
Joined: Mar 2008
Posts: 6,056
South Florida
bubbatime Offline
bubbatime  Offline

Joined: Mar 2008
Posts: 6,056
South Florida
I've seen some bad oil but I have never seen sludge oil in a mower, unless perhaps it sat outside and water got in it.

Just change the oil with SAE30. Then do another change in about 10 hours, then once a year after that.

But really, my best advice is to keep monitoring Craigslist and get a better mower. No way I could mow with one of those old Briggs 3HP flat heads. They are dogs.

Sell your current mower for more than you paid and upgrade to a better mower, for likely the same amount of money. You can especially find a good deal if it has a bad carb on it. Slap a new $13 carb on it, and good to go. I have literally bought $650 Toro Super Recycler, two years old, with a gummed up carb for $5. person bought a new mower, and just wanted it gone.


17 Chrysler Pacifica Edge Syn 5W30
13 Yamaha XT250 Valv MC 10W40
10 Acura TSX 2.4 SuperTech Syn 5W20
06 GMC Sierra SuperTech 10W30


Re: Briggs and Stratton desludging [Re: Oldtom] #4806193
07/05/18 07:00 PM
07/05/18 07:00 PM
Joined: Jan 2011
Posts: 2,904
N.Ohio
Lubener Offline
Lubener  Offline

Joined: Jan 2011
Posts: 2,904
N.Ohio
A couple 5 hour oil changes(30HD), no kerosene and once a year thereafter.. It's just a lawn mower and it will be fine. I have seen those B&S engines which never had an oil change kept on performing.

Last edited by Lubener; 07/05/18 07:06 PM.

The "thinking" man's friend.
Re: Briggs and Stratton desludging [Re: Oldtom] #4806213
07/05/18 07:26 PM
07/05/18 07:26 PM
Joined: Mar 2004
Posts: 1,562
Flaherty, KY
92saturnsl2 Offline
92saturnsl2  Offline

Joined: Mar 2004
Posts: 1,562
Flaherty, KY
15w-40 would be my choice. Or just change oil and use it-- those engines don't really care what's in them or how sludged up they are; they typically last longer than what they're bolted to, especially an MTD.


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40 HDEO
04 Odyssey EX 184k Valv. Durablend 5w-30
96 Maxima GLE 255k Castrol Edge EP 5w-20
07 Chrysler Pacifica Limited 4.0L 134k Chevron Supreme 5w-20
Re: Briggs and Stratton desludging [Re: Oldtom] #4806378
07/05/18 10:58 PM
07/05/18 10:58 PM
Joined: Oct 2014
Posts: 13,070
Canyon County Idaho
CT8 Offline
CT8  Offline

Joined: Oct 2014
Posts: 13,070
Canyon County Idaho
i would just cut the lawn and do a few changes to see how much crud comes out.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Briggs and Stratton desludging [Re: Lubener] #4806462
07/06/18 05:41 AM
07/06/18 05:41 AM
Joined: Jun 2011
Posts: 1,247
Texas
wag123 Offline
wag123  Offline

Joined: Jun 2011
Posts: 1,247
Texas
Originally Posted By: Lubener
A couple 5 hour oil changes(30HD), no kerosene and once a year thereafter.. It's just a lawn mower and it will be fine. I have seen those B&S engines which never had an oil change kept on performing.

+1

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