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#4537303 - 10/08/17 03:57 PM Oil for Honda GX270 pressure washer?
Avery4 Offline


Registered: 01/29/14
Posts: 270
Loc: USA
I found a 3200 PSI pressure washer in the garbage with a Honda GX270 engine on it. The only thing that was wrong with it was it was hydrolocked with oil. I removed the spark plug, cranked the engine a few times to push the oil out, and it started right up and ran perfect! The motor does not leak or burn oil and has great compression. The pump works great too. My question is what type and brand of oil to use? I live in a hot climate, so I am thinking a synthetic 10w30 or 10w40 would work well. I want the engine to last as long as possible, so I would like to use the best oil that I can use. I don't have a problem paying for quality.

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#4537323 - 10/08/17 04:21 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
skyactiv Offline


Registered: 03/02/13
Posts: 4501
Loc: The Midwest
You'd have to use it commercially quite awhile for the engine to wear out. You'll never wear the engine out for typical home owners use. I owned a motorcycle that had a faulty petcock that let gas seep into the cylinder which hydro locked it. Oil? If you get 20 responses you will get different answers. None of us know which is best. Me? I'd like to think something that meets the Porsche A40 spec will be best. Buy a quart of Pennzoil Platinum Euro 5W40 at Advance Auto.
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#4537329 - 10/08/17 04:36 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
Gebo Offline


Registered: 09/18/02
Posts: 2154
Loc: VA
I use one of the Amsoil Small Engines oils (10w30 or 10w40) and their Compressor Oil ISO 100-SAE 30/40 in the pump.
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#4537334 - 10/08/17 04:51 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
NormanBuntz Offline


Registered: 07/27/13
Posts: 2165
Loc: Outer Banks, NC
My Honda GC160 manual specs 10w-30 synthetic. My pressure washer is 2600 psi.
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#4537336 - 10/08/17 04:58 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
Panzerman Offline


Registered: 12/16/06
Posts: 4213
Loc: Port Orange, Florida
I've found my Honda engines like a thicker oil.
I like straight 30HD.
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#4537337 - 10/08/17 05:03 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
Alex_V Offline


Registered: 04/10/16
Posts: 1174
Loc: Campbellsville, KY
A good quality straight 30 wt. changed annually (assuming just occasional use) should protect it long past when other components give out. You can use more expensive or specialized multi-viscosity oils if it suits you, but a stout SAE30 will hold up well in warm climates.
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#4537342 - 10/08/17 05:12 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
Rand Offline


Registered: 08/20/03
Posts: 12728
Loc: NE,Ohio
I am using valvoline vr1 10w30 syn in mine.. but I had it in the garage.
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#4537394 - 10/08/17 06:19 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
NibbanaBanana Offline


Registered: 05/23/16
Posts: 293
Loc: New England
I have the Honda GX340 engine on my two wheel tractor. Bought about 7 years ago IIRC. The manual says 5w-30 or 10w-30 depending on temperatures. I assume it would be the same for the GX270. You live in a hot climate so use 10w-30. I use M1 personally.
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#4537475 - 10/08/17 08:06 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
mechjames Offline


Registered: 01/16/08
Posts: 518
Loc: Richmond, BC, Canada
10w30 in engine, sae30 ND (non detergent) in pump
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#4537497 - 10/08/17 08:35 PM Re: Oil for Honda GX270 pressure washer? [Re: mechjames]
Avery4 Offline


Registered: 01/29/14
Posts: 270
Loc: USA
Originally Posted By: mechjames
10w30 in engine, sae30 ND (non detergent) in pump

Why non detergent oil for the pump?

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#4537503 - 10/08/17 08:38 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
bubbatime Offline


Registered: 03/18/08
Posts: 5723
Loc: South Florida
I like SAE30 or 15W40 for that application. Synthetic 10W30 is also good.
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#4537507 - 10/08/17 08:41 PM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
Finz Offline


Registered: 06/06/13
Posts: 699
Loc: Northeast
Personally, I'd use an SAE30... Supertech would be my choice. Just make sure to keep it topped up and perform routine OCIs and it should run for years and years
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#4537685 - 10/09/17 06:49 AM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
Cujet Offline


Registered: 02/15/03
Posts: 7238
Loc: Jupiter, Florida
Use any quality oil with a high HTHS. The oil viscosity under very high temps is important in air cooled engines. That's why straight 30 is a good suggestion. Other oils with a high HTHS include 10W-40 M1 HM, 10W-40 M1 motorcycle (a superb oil) , 5W-40 M1 TDT, 15W-50 M1 and so on.
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#4537769 - 10/09/17 08:49 AM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
JHZR2 Offline



Registered: 12/14/02
Posts: 41896
Loc: New Jersey
Id put 10w-30 synthetic in it (Amsoil ACD is the best), or else a 30wt.

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#4537888 - 10/09/17 11:08 AM Re: Oil for Honda GX270 pressure washer? [Re: Avery4]
FastLane Offline


Registered: 12/10/14
Posts: 458
Loc: MB - Manitoba
I use M1 10W30 in my 2800 psi Honda powered pressure washer.
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