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#483632 - 06/06/04 10:52 AM Re: How Often to change Mower Oil
olddognewtrks Offline

Registered: 08/20/03
Posts: 402
Loc: The Mid South
My circumstances are probably outside the norm. I mow/thrash into submission about 2 1/2 acres with my 18.5 hp B&S V-twin riding mower. Extremely dusty with our Arkansas summer heat, sandy clay soil and degrading pine needles and leaves from scores of trees. [Frown] I change oil (Delvac 1300 15-40)and filter (oversized Motorcraft FL400s or now a Wix 51516-bettter than my car can use) twice a season, which is about every 18-22 hours. Oiled pre-filter is checked/cleaned about every 3 hour run. Engine cooling shroud is pulled to clean dust from the cooling fins several times a season. Very probably overkill, but it's only $7-10 a year more to protect a $1300 unit.

#483633 - 06/06/04 11:33 PM Re: How Often to change Mower Oil
harrydog Offline

Registered: 07/17/03
Posts: 797
Loc: Ohio
A guy I work with, who has a commercial lawn care business on the side, told me he that he changes the oil at the end of the season, before he puts the equipment away. The mowing season begins in late March, so in late May or early June, he changes the oil again, which lasts until the season ends in late October. He doesn't go by hours. His equipment seems to be holding up well, but I'd probably do one additional change per year if it were my business.

#483634 - 06/17/04 07:03 PM Re: How Often to change Mower Oil
KW Offline

Registered: 09/04/03
Posts: 1686
Loc: Central Arkansas
I change the oil in my lawn equipment every fall and everything seems to be holding up very well. My Dad has been mowing 3 acres with an MTD riding mower (about 3 hours twice a week) for seven years. He did not change the oil for the first three years until I started doing it for him in the fall 4 years ago. Currently everything either has M1 0W40 or Rotella T 5W40. This fall everything but the old MTD may go to Amsoil 10W30.

#483635 - 06/20/04 02:29 AM Re: How Often to change Mower Oil
65hoss Offline

Registered: 10/17/03
Posts: 28
Loc: Memphis
I own a comm'l Lawn Business. I've run Opti-4 in all the motors until recently. Changed to 15w-40 Rotella. The oil is changed every 45-50 hours. A homeowner mower can be about 1 change per year and be fine. Use a high quality oil and keep the air filters clean.

#483636 - 06/25/04 06:49 AM Re: How Often to change Mower Oil
Hokiefyd Offline

Registered: 06/24/04
Posts: 14498
Loc: Top of Virginia
I'll probably change mine 3 times a season, which I understand is huge overkill. But with the oil being unfiltered, and possibly run under very harsh circumstands (in an air-cooled engine in 100*F weather), I figure the oil is cheap insurance, especially at 20 oz per change. It's only about $3/year to change the oil 3 times for the typical 4-stroke push mower.

My last B&S Quantum engine very heavily soiled the oil after only one season of mowing. I don't know how old the oil was when I got the mower, but I changed the oil before I ever used it. At the end of the season, before I sold it off, I changed it again and it was dark as night. Very nasty looking. I admit it could have been due to many things, but I decided then and there that I wasn't going to let that happen again, no way no how. [Smile]

#483637 - 06/26/04 05:59 AM Re: How Often to change Mower Oil
wtd Offline

Registered: 06/25/02
Posts: 1751
Loc: southwest Mo.
I change mine once a year at the end of the mowing season. This is on a murrey push mower I bought new in 1992 with the Tecumseh engine. Oil is still clear at the end of the season and the engine still runs like new. I use any dino 30wt.


#483638 - 06/29/04 04:27 PM Re: How Often to change Mower Oil
seotaji Offline

Registered: 02/16/04
Posts: 1139
Loc: USA
i have a B&S 4.5hp

what is the best way to change the oil in a push mower? should i build a makeshift ramp? leave it to drain for a couple of hours? pour some oil through the top to flush the oil out?

any advice would be great.

#483639 - 06/29/04 04:52 PM Re: How Often to change Mower Oil
Matt_S Offline

Registered: 12/02/03
Posts: 3094
Loc: Metro Detroit
I just prop mine up on a couple of lawn chairs and drain it 'till it drips slowly. I try not to put too much thought into the mower. Those engines will last forever, anyway.

#483640 - 06/29/04 06:20 PM Re: How Often to change Mower Oil
seotaji Offline

Registered: 02/16/04
Posts: 1139
Loc: USA
yeah, i was leaning towards that direction [Smile]

i don't have my model number with me, but is it safe to say that most of the 4-6HP b&s engines use the same spark plug?

[ June 30, 2004, 09:22 AM: Message edited by: seotaji ]

#483641 - 06/29/04 08:16 PM Re: How Often to change Mower Oil
tmorris1 Offline

Registered: 07/15/03
Posts: 2167
Loc: MN
Most use the Champion RJ19LM plug I believe.

#483642 - 07/01/04 12:01 AM Re: How Often to change Mower Oil
Bill Kapaun Offline

Registered: 11/15/02
Posts: 788
Loc: Oregon
Originally posted by tmorris1:
Most use the Champion RJ19LM plug I believe.

Not saying you're wrong, but I'd definitely check the owners manual.
With the "newer" engines out, (OHV etc), some may not use the old "standard" plugs.
There is also an (R?)J17LM plug used on a lot of engines.
If you don't have a manual, you can download one from the Briggs site.
Better to be safe than....

#483643 - 07/01/04 03:19 AM Re: How Often to change Mower Oil
Brett Miller Offline

Registered: 09/09/03
Posts: 2636
Loc: Arizona
A J19LM will work in about any flathead Briggs and Stratton. Or the good old J8.

#483644 - 07/01/04 04:13 AM Re: How Often to change Mower Oil

The 6.5 intek on my lawnmower uses the same plug as my Jeep. [Smile] Don't remember the part number, but it's alot larger than older style plugs.

#483645 - 07/01/04 04:51 AM Re: How Often to change Mower Oil
Hokiefyd Offline

Registered: 06/24/04
Posts: 14498
Loc: Top of Virginia
For spark plug questions, I've found to be an excellent resource. They sell many popular brands, and have cross references for just about all major brands.

For instance, my '03 Honda GCV160 takes an NGK BPR6ES plug. Check out all the wild and varying applications for that plug!

[ July 01, 2004, 07:56 PM: Message edited by: Jason Adcock ]

#483646 - 07/15/04 11:29 AM Re: How Often to change Mower Oil
seotaji Offline

Registered: 02/16/04
Posts: 1139
Loc: USA
I purchased some walmart HD30 to use in my lawnmowers w/B&S engines.

It seems thinner than I rememeber. Am I going crazy or did I pick the wrong oil?

The 1/2 qt. of B&S oil that came with the mower seemed thicker.

Maybe I'm crazy. Should I even worry? Walmart straight 30 is a decent brand right?

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