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#1948410 - 07/09/10 10:52 PM Best oil for Honda OHC engine on lawnmower?
Mystic Offline

Registered: 03/05/03
Posts: 8467
Loc: Colorado
What is the best oil for a Honda 160cc OHC engine on a lawnmower? The owner's manual says to use 10W30 oil although 30 weight oil can also be used. The oil that came with the lawnmower was some forgettable cheap oil in a 20 ounce container (SB rated I think).

I heard a story somewhere that synthetic oil is not recommended for these Honda engines. I have been using Valvoline 10W30 and 30 weight oil. I changed the oil today. I could not find 30 weight Valvoline so I used Castrol 30 weight.

#1948425 - 07/09/10 11:02 PM Re: Best oil for Honda OHC engine on lawnmower? [Re: Mystic]
Quest Offline

Registered: 12/19/04
Posts: 7303
Loc: beaver land EH?
10W30 is highly recommended.

In fact: simply treat these lil air-cooled Honda engine as their bigger brother (in cars) and use multi-vis oil inside, syn no problem.

I have a GX135 been in use for 10yrs (pressure washer) and i just dump anything left behind from cars: 10W30, 15W40, HDEO, syn, etc.

"Internet discussion boards act as echo chambers for conspiracy dittoheads" A.Allen

#1948426 - 07/09/10 11:04 PM Re: Best oil for Honda OHC engine on lawnmower? [Re: Mystic]
dwendt44 Offline

Registered: 05/17/06
Posts: 3571
Loc: Central Wisconsin
10W-30 is fine. 10W-40 is Ok, Shell Rotella 15W-40 is great as well.
Use quality oil in any case.
Engine will outlast the rest of the mower.
There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.

#1948428 - 07/09/10 11:08 PM Re: Best oil for Honda OHC engine on lawnmower? [Re: dwendt44]
Mystic Offline

Registered: 03/05/03
Posts: 8467
Loc: Colorado
Thanks guys! I have been using 10W30 in the early spring and late fall and 30 weight oil in the hot summertime. If I can use 10W30 oil year round without problems that will be okay with me.

What about synthetic oil? Can I use Platinum Ultra 10W30?

#1948438 - 07/09/10 11:22 PM Re: Best oil for Honda OHC engine on lawnmower? [Re: Mystic]
ThirdeYe Offline

Registered: 02/23/07
Posts: 7883
Loc: Walker, MI
I like to use Shell Rotella T 10W-30 in our Honda GCV160 OHC lawnmower.
99 Pontiac Firebird - 89k - Pennzoil Platinum 5W-30/Fram Extended Guard XG3980
08 Scion tC - 107k - QSUD 0W-20/Napa Gold 1394

#1948442 - 07/09/10 11:25 PM Re: Best oil for Honda OHC engine on lawnmower? [Re: Mystic]
Johnny Offline

Registered: 05/27/02
Posts: 14013
Loc: Retired | Wausau, WI
I really like the Platinum 10W-30 in those Honda mowers, wish I had one. I am using Platinum 5W-30 in my Honda snowblower and it works great.

#1948444 - 07/09/10 11:29 PM Re: Best oil for Honda OHC engine on lawnmower? [Re: dwendt44]
Newtonville Offline

Registered: 01/19/09
Posts: 267
Loc: USA
I use the MC blend 10w-30 in Honda powered p. washer and 7hp tiller. Run very well on it. I think it doesn't matter so much, as one usually doesn't mow grass, till, or PW in the snow. But on the other hand the same principles apply as on a car engine, the oil splashes around faster when cold with the 10w, even at 90 deg F. In theory that should be a little better.

I started using MC blend on my cars long before looking in this site. It just sounded like it was good oil in the engine. Read here that yes MC is good stuff, supporting the feeling. Now use 0w 30 AFE to try to make something better that probably didn't need to be made better. Seems like the more one thinks the more one worries what works best and changes things. Just observation.

#1948496 - 07/10/10 01:57 AM Re: Best oil for Honda OHC engine on lawnmower? [Re: Newtonville]
nthach Offline

Registered: 01/02/04
Posts: 1846
Loc: California
Treat it like a little Honda. I used 10W-30 Chevron Supreme in ours before we got rid of it. I have MaxLife in the neighbor's Honda/Poulan mower.

#1948531 - 07/10/10 06:28 AM Re: Best oil for Honda OHC engine on lawnmower? [Re: nthach]
Colt Offline

Registered: 02/28/05
Posts: 1643
Loc: NJ
AMSOIL 10W-30/SAE 30 Synthetic Small Engine Oil
'15 Hyundai Sonata Sport Pearl White/Black Premium Pkg Factory Castrol Fill
'15 Lexus RX350 AWD Silver/Black NAV etc TGMO 0w20 OEM Filter

#1948543 - 07/10/10 06:56 AM Re: Best oil for Honda OHC engine on lawnmower? [Re: Colt]
GrtArtiste Offline

Registered: 11/29/03
Posts: 519
Loc: Ohio
Mine gets Phillips TropArtic 10w30.

#1948544 - 07/10/10 06:59 AM Re: Best oil for Honda OHC engine on lawnmower? [Re: Colt]
hate2work Offline

Registered: 09/04/08
Posts: 4617
Loc: Western Washington
Originally Posted By: Colt
AMSOIL 10W-30/SAE 30 Synthetic Small Engine Oil

This is what I use in my Honda mower. Very good oil.

#1948586 - 07/10/10 07:57 AM Re: Best oil for Honda OHC engine on lawnmower? [Re: hate2work]
Scooter_man Offline

Registered: 03/24/10
Posts: 294
Loc: Missouri, USA
Another vote for Rotella T 10w30

Member of the 100+ mpg Club!

#1948651 - 07/10/10 09:21 AM Re: Best oil for Honda OHC engine on lawnmower? [Re: Scooter_man]
1999nick Offline

Registered: 01/14/04
Posts: 1087
Loc: Germantown TN 38138
I have used Mobil 1 in my Honda 160 since dumping the factory provided fill at 5 hours. I purchased my mower in 2000, and it has had yearly oil changes, at 55 to 65 hours. I have an hour meter on my mower, and it just passed 550 hours.

I used M1 5W30 oil until my stash of SL oil ran out a couple of years ago. One year, I had a quart of 0W30 on hand, and I used it. The little engine was never down more than a sixteenth of an inch on the dipstick at the end of a 60 hour, one year run.

With the advent of SM oils, I have changed over to M1 High Mileage oil, which is still SL. The engine still, after 10 years and 550 hours, uses absolutely no oil. It has only had M1 in the above mentioned weights. It even used no oil the year I used 0W30.

The oil has always looked pretty good at the end of the year, but I always change it anyway. The 2000 owner's manual says to change it at 25 hours, so I figure that one year, 60 hours, is long enough.

#1948655 - 07/10/10 09:26 AM Re: Best oil for Honda OHC engine on lawnmower? [Re: 1999nick]
StevieC Offline

Registered: 08/21/08
Posts: 14339
Loc: Niagara Falls, ON, CA (near)
I would use a Grp-III synthetic 10w30 in the engine, but you might want to run a cheesy dino oil first (even the SB rated stuff it came with) to facilitate a bit of break-in then switch to your oil of choice.

Make sure for the first little bit you don't over rev the engine and let it warm up on slow speed before switching to full speed. This will greatly extend its life later on.

I would have to agree with Johnny, PP would be great in this engine.
'06 Hyundai Sante Fe - 330K KM's
Current Oil: RLI 0w30 (Ask me why)

Don't be part of the Sheeple, check frequently for wool over your eyes. wink

#1948711 - 07/10/10 10:24 AM Re: Best oil for Honda OHC engine on lawnmower? [Re: StevieC]
Craig in Canada Offline

Registered: 04/06/06
Posts: 1995
Loc: Toronto-ish, Canada
I have a GC160 on a power washer which was used in commercial service for an unknown number of hours. It's most quiet on 15W40 HDEO - no leaks, no consumption.

I also have a GXV140 on a Honda Masters mower I've had since new in 2003. I ran M1 10W30 in that years ago for a while (probably API SL), then some "misc" syn left over from vehicles, then I switched to Amsoil ASE. As soon as I did that, all kinds of noises have increased. I'll probably start running 15W40 in it after my supply of ASE is gone.

My cold weather OPE (a 1986 Toro 824 snowthrower with Tecumseh HM80) gets GC.

Edited by Craig in Canada (07/10/10 10:36 AM)

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