10-30W versus 10-40W

Doc_Bob · 05-12-2008, 01:02 PM

I have a Honda powered power washer (air cooled engine) and the owners manual states 10-30W or 30W oil for the engine. I have a couple of cases of 10-40W pennzoil. Can I use the 10-40W pennzoil instead of 10-30W oil?????
Bob

Doc_Bob · 05-12-2008, 01:57 PM

"Singlegrade oils will become obsolete for performance engines in the future. We dropped SAE 30 and SAE 40 because SAE 10W40 does everything 30 or 40 can doé*nd some things the straight grades can't doæ§˜ike increasing horsepower. If an off-roader doesn't like 10W40, then use 20W50. It can do everything a 10W40 can do except pass the sub-zero viscosity test at -20 degrees C."

Oil Viscosity

I still don't k now the answer to my question. Just thought i would post this anyway.
Bob

Doc_Bob · 05-12-2008, 02:29 PM

"SAE 30 is SAE 30 no matter what the "W" prefix number is: 0W, 5W or 10W. This viscosity in centistokes (cSt) @ 100 degrees C is with the minimum of 9.3 cSt and a maximum of 12.5 cSt.

"SAE 40 is SAE 40 no matter what the "W" prefix number is: 5W, 10W, 15W or 20W. The viscosity @ 100 degrees C is within the minim of 12.5 cSt and a maximum of 16.3 cSt.

"SAE 50 is SAE 50 no matter what the "W" prefix number is: 5W, 10W, 15W or 25W. The viscosity @ 100 degrees C is within the minimum of 16.3 cSt and a maximum of 21.9 cSt.

So cSt is the "key".

30 weight has min 9.3 and max 12.5 at 100 degrees C

40 weight has min 12.5 and max 16.3 cSt at 100 degrees C.

So, technically, 40 W can fall in the range for 30W at 100 degrees C. with a cSt 12.5.

Wayne County Hose · 05-12-2008, 03:18 PM

Bob,

I do not know the answer to your question. However, I will offer this. If you are going to talk to yourself, you should do so under different screen names. It really doesn't look good. I do talk to myself too, I even argue with myself, but I follow 2 rules. 1. Don't do so when there's witnesses. 2. If you argue with yourself, you better not lose!

Andy.

MrJimi · 05-12-2008, 03:26 PM

Andy, that was real funny

I have an older PW and it says to use a 30 weight not a mixed weight, there is a difference in the oil big time. You may have a newer one than mine
good luck and carry on with your conversation, sorry to have interrupted you

RWEST · 05-12-2008, 05:54 PM

Quote:

If you are going to talk to yourself, you should do so under different screen names. It really doesn't look good. I do talk to myself too, I even argue with myself, but I follow 2 rules. 1. Don't do so when there's witnesses. 2. If you argue with yourself, you better not lose!

ROFL!!! That's funny!!

Red55 · 05-12-2008, 07:25 PM

Bob and everyone else ya a riot!

BUT if you think you're talking to yourself now wait until you're having problems because you didn't spring for 10w30 OIL! Buy the right stuff JMHO -Ed

3RRL · 05-13-2008, 01:34 PM

Yeah, that was a great reply Andy!
I agree, why not get what your engine calls for? It can't take that much oil and it leaves the other stuff for your other engine or whatever you bought all the 10w40 for.

RalphVa · 05-13-2008, 06:39 PM

The 10w40 will work fine. At startup, it'll work like a 10w and is approved (e.g. 10w30). At operating temperature, it'll be slightly more viscous than a 10w30 or 30w. You won't notice any difference in performance.

Ralph

Doc_Bob · 05-13-2008, 11:59 PM

I enjoyed the conversation, I knew exactly what I was going to say and I agreed with every word!
Bob

05-12-2008, 01:02 PM	#1 (permalink)
Doc_Bob Elite Member Join Date: Mar 2006 Location: Wisconsin Posts: 2,700	10-30W versus 10-40W I have a Honda powered power washer (air cooled engine) and the owners manual states 10-30W or 30W oil for the engine. I have a couple of cases of 10-40W pennzoil. Can I use the 10-40W pennzoil instead of 10-30W oil????? Bob

05-12-2008, 01:57 PM	#2 (permalink)
Doc_Bob Elite Member Join Date: Mar 2006 Location: Wisconsin Posts: 2,700	Re: 10-30W versus 10-40W "Singlegrade oils will become obsolete for performance engines in the future. We dropped SAE 30 and SAE 40 because SAE 10W40 does everything 30 or 40 can doé*nd some things the straight grades can't doæ§˜ike increasing horsepower. If an off-roader doesn't like 10W40, then use 20W50. It can do everything a 10W40 can do except pass the sub-zero viscosity test at -20 degrees C." Oil Viscosity I still don't k now the answer to my question. Just thought i would post this anyway. Bob

05-12-2008, 02:29 PM	#3 (permalink)
Doc_Bob Elite Member Join Date: Mar 2006 Location: Wisconsin Posts: 2,700	Re: 10-30W versus 10-40W "SAE 30 is SAE 30 no matter what the "W" prefix number is: 0W, 5W or 10W. This viscosity in centistokes (cSt) @ 100 degrees C is with the minimum of 9.3 cSt and a maximum of 12.5 cSt. "SAE 40 is SAE 40 no matter what the "W" prefix number is: 5W, 10W, 15W or 20W. The viscosity @ 100 degrees C is within the minim of 12.5 cSt and a maximum of 16.3 cSt. "SAE 50 is SAE 50 no matter what the "W" prefix number is: 5W, 10W, 15W or 25W. The viscosity @ 100 degrees C is within the minimum of 16.3 cSt and a maximum of 21.9 cSt. So cSt is the "key". 30 weight has min 9.3 and max 12.5 at 100 degrees C 40 weight has min 12.5 and max 16.3 cSt at 100 degrees C. So, technically, 40 W can fall in the range for 30W at 100 degrees C. with a cSt 12.5.

05-12-2008, 03:18 PM	#4 (permalink)
Wayne County Hose Veteran Member Join Date: Aug 2007 Location: Wayne County Pa. Posts: 1,354	Re: 10-30W versus 10-40W Bob, I do not know the answer to your question. However, I will offer this. If you are going to talk to yourself, you should do so under different screen names. It really doesn't look good. I do talk to myself too, I even argue with myself, but I follow 2 rules. 1. Don't do so when there's witnesses. 2. If you argue with yourself, you better not lose! Andy. __________________ Knowing is not enough, you must apply. Willing is not enough, you must do. Bruce Lee

05-12-2008, 03:26 PM	#5 (permalink)
MrJimi Elite Member Join Date: Jan 2006 Location: NorthEast, Florida Posts: 2,507	Re: 10-30W versus 10-40W Andy, that was real funny I have an older PW and it says to use a 30 weight not a mixed weight, there is a difference in the oil big time. You may have a newer one than mine good luck and carry on with your conversation, sorry to have interrupted you __________________ Click here for my current weather Case 1845C with dirt bucket, forks, 3 point quick hitch on the front, 30'. boom, 6 & 1/2 foot disc harrow, 5 foot Howse RC, root and tree bucket and Grouser tracks and a Ford F-550 pick up,7.3 Turbo with Auto and a Crosley 25' X 8'.6" X 14 K D/O trailer. PDF files don't like me !! Making a F-550 Pick Up thread My Gallery My other Gallery Revielle video here Dear Eliot

05-12-2008, 07:25 PM	#7 (permalink)
Red55 Silver Member Join Date: Jun 2007 Location: Southern NY Posts: 218	Re: 10-30W versus 10-40W Bob and everyone else ya a riot! BUT if you think you're talking to yourself now wait until you're having problems because you didn't spring for 10w30 OIL! Buy the right stuff JMHO -Ed

05-13-2008, 01:34 PM	#8 (permalink)
3RRL Super Member Join Date: Oct 2005 Location: Foothills of the Giant Sequoia's, California Posts: 5,347	Re: 10-30W versus 10-40W Yeah, that was a great reply Andy! I agree, why not get what your engine calls for? It can't take that much oil and it leaves the other stuff for your other engine or whatever you bought all the 10w40 for. __________________ Rob- ...The Older I get...the Better I Used to be...

05-13-2008, 06:39 PM	#9 (permalink)
RalphVa Veteran Member Join Date: Dec 2003 Location: Charlottesville, VA, USA Posts: 2,499	Re: 10-30W versus 10-40W The 10w40 will work fine. At startup, it'll work like a 10w and is approved (e.g. 10w30). At operating temperature, it'll be slightly more viscous than a 10w30 or 30w. You won't notice any difference in performance. Ralph __________________ The natural gardener God's original intent

05-13-2008, 11:59 PM	#10 (permalink)
Doc_Bob Elite Member Join Date: Mar 2006 Location: Wisconsin Posts: 2,700	Re: 10-30W versus 10-40W I enjoyed the conversation, I knew exactly what I was going to say and I agreed with every word! Bob

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