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Water cooled bike and 5w-30 Syn oil? #4665582
02/14/18 10:08 AM
02/14/18 10:08 AM
Joined: Mar 2008
Posts: 5,942
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 5,942
Michigan
Any reason why a water cooled bike couldn't just use a 5w30 instead of a 40 weight? Would the lighter oil possibly yield better power and mpg?


2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40
Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4665586
02/14/18 10:14 AM
02/14/18 10:14 AM
Joined: Mar 2010
Posts: 493
Chicago Suburbs
Nitronoise Offline
Nitronoise  Offline
Joined: Mar 2010
Posts: 493
Chicago Suburbs
does your bike have a shared sump for engine and trans ,

I run 5W40 Rotella in my gold wing

30 might sheer down to real thin with the oil running through the trans and clutch

MPG"s?? I never cared my bike is fun time not worried about mpg's bring on spring to start the riding season


07 Ford Freestyle 135K
04 Hyundai Sonata 280K
03 Hyundai Santa Fe 165K
02 Ford Tarus 98K
00 Buick Regal SC 135K
95 Goldwing 28K

Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4665587
02/14/18 10:14 AM
02/14/18 10:14 AM
Joined: Apr 2014
Posts: 607
MN
ironman_gq Offline
ironman_gq  Offline
Joined: Apr 2014
Posts: 607
MN
Does this bike share a sump with the transmission? Motorcycles and similar motors tend to be pretty hard on oil and shear them down pretty quick.

Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4665679
02/14/18 11:57 AM
02/14/18 11:57 AM
Joined: Aug 2008
Posts: 3,147
USA
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,147
USA
The water cooled bikes I've owned have all run HOTTER than the air-cooled ones. Combine this with a shared sump and the 40wt was more than justified.

Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4665849
02/14/18 02:33 PM
02/14/18 02:33 PM
Joined: Jun 2017
Posts: 160
New York
jeff78 Offline
jeff78  Offline
Joined: Jun 2017
Posts: 160
New York
While I don't disagree with the concerns about shear, it's interesting to note that Honda has recommended 10W-30 for many of their bikes for a good number of years now.

Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4665940
02/14/18 04:11 PM
02/14/18 04:11 PM
Joined: Mar 2010
Posts: 493
Chicago Suburbs
Nitronoise Offline
Nitronoise  Offline
Joined: Mar 2010
Posts: 493
Chicago Suburbs
mine has been 10-40 by the owners man,,, i went to rotells t6 3 years ago not an issue with clutch or tranny runs like a champ......

quiet as a church mouse


07 Ford Freestyle 135K
04 Hyundai Sonata 280K
03 Hyundai Santa Fe 165K
02 Ford Tarus 98K
00 Buick Regal SC 135K
95 Goldwing 28K

Re: Water cooled bike and 5w-30 Syn oil? [Re: jeff78] #4666090
02/14/18 06:49 PM
02/14/18 06:49 PM
Joined: Aug 2014
Posts: 1,313
Tasmania, Australia
hpb Offline
hpb  Offline
Joined: Aug 2014
Posts: 1,313
Tasmania, Australia
Originally Posted By: jeff78
While I don't disagree with the concerns about shear, it's interesting to note that Honda has recommended 10W-30 for many of their bikes for a good number of years now.


Yep. My Honda NC750 is spec'd for 10w30. I've also run it on 5w30, and it's currently using a 10w40. Honestly, not a bit of difference between them in power or economy, and it's a pretty underpowered bike, so I'd notice any extra HP. If anything, the 10w40 gives a smoother gear change.


MY16 Mitsubishi Outlander 2.2 diesel, 51,000km - Castrol 5w30
2006 Ford Falcon 4.0, 135,000km - Penrite Vantage 15w40, Ryco filter
Re: Water cooled bike and 5w-30 Syn oil? [Re: hpb] #4666109
02/14/18 07:27 PM
02/14/18 07:27 PM
Joined: Jul 2011
Posts: 151
California
David_g Offline
David_g  Offline
Joined: Jul 2011
Posts: 151
California
Horsepower differences are there but quite small in this report:
http://www.eatonbalancing.com/2015/02/01/oil-viscosity-and-its-effect-on-engine-power/

It's an automotive V8, but still might apply. I wouldn't choose an oil grade for my bike to increase power.

I've been using 10W30 in my shared sump Honda because it's the only recommended grade. But when I was preparing to depart on a roadtrip last September and it was 110-111F, concerns about my gearbox health operating in temps that hot with oil that thin were one factor in my decision to switch bikes--the bike I took was running 15W50, and FWIW reported an ambient temp as high as 116F during the 1st leg of the trip. I was glad I didn't take the Honda. I can hardly wrap my mind around 10W30 protecting the gearbox in normal temperatures, but still I had been following Honda's recommendation.

I think that Honda will be getting 10W40 next oil change. Motul 5100 probably because I got a gallon on sale recently, though I have almost enough Mobil 1 4T in the garage, and I think that lasts longer.

Last edited by David_g; 02/14/18 07:29 PM.

2007 BMW R1200R (Mobil 1 15W50, Red Line Shockproof Heavy, Supertech 75W90)
2016 Honda Africa Twin DCT (Motul 5100 10W40)
Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4666111
02/14/18 07:30 PM
02/14/18 07:30 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Super Tech and Traveler 15W-40 went for 84,000 miles in my 1999 Suzuki Marauder!


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Water cooled bike and 5w-30 Syn oil? [Re: Linctex] #4666250
02/14/18 09:51 PM
02/14/18 09:51 PM
Joined: Jul 2011
Posts: 151
California
David_g Offline
David_g  Offline
Joined: Jul 2011
Posts: 151
California
Originally Posted By: Linctex
Super Tech and Traveler 15W-40 went for 84,000 miles in my 1999 Suzuki Marauder!

That's a long OCI!


2007 BMW R1200R (Mobil 1 15W50, Red Line Shockproof Heavy, Supertech 75W90)
2016 Honda Africa Twin DCT (Motul 5100 10W40)
Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4666436
02/15/18 07:03 AM
02/15/18 07:03 AM
Joined: Jul 2012
Posts: 2,302
South Carolina
alarmguy Offline
alarmguy  Offline
Joined: Jul 2012
Posts: 2,302
South Carolina
Originally Posted By: ZZman
Any reason why a water cooled bike couldn't just use a 5w30 instead of a 40 weight? Would the lighter oil possibly yield better power and mpg?


Yes, not to be funny but the manufacturer knows why way better then us. :o)

But serious, coolant temperature is not as relative to oil temperature as people think.
If your coolant is 220 degrees your oil can easily be 250.
All engines different but the manufacturer knows what is best, also why I dont know of many bike manufacturers that recommend a 5w/.. oil.

Warm weather riding I always ran 20w50 in my water cooled Vstar 1300, much better shifting once the oil got hot. Winter I would run 15w40.
The lowest viscosity recommended oil for that bike is 10/40, its for a reason.

Last edited by alarmguy; 02/15/18 07:08 AM.

14 Road King (current)
08 VStar 1300 Tourer
07 Suzuki C50
Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4667304
02/15/18 11:23 PM
02/15/18 11:23 PM
Joined: May 2012
Posts: 1,399
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,399
Georgia
Isn't all 5w30 labeled as energy conserving? Every bike (wet clutch) I have seen said to avoid energy conserving oils.

Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4668890
02/17/18 04:59 PM
02/17/18 04:59 PM
Joined: Feb 2005
Posts: 1,771
Arizona
bulwnkl Offline
bulwnkl  Offline
Joined: Feb 2005
Posts: 1,771
Arizona
Don't know about the 5W30, but if you want to go for broke, Red Line's 0W20 is frictionally compatible with the JASO MA spec. (-;

Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4668909
02/17/18 05:27 PM
02/17/18 05:27 PM
Joined: Aug 2014
Posts: 1,313
Tasmania, Australia
hpb Offline
hpb  Offline
Joined: Aug 2014
Posts: 1,313
Tasmania, Australia
The 5w30 I used in my Honda was Penrite, met JASO MA spec, so not Energy Conserving.


MY16 Mitsubishi Outlander 2.2 diesel, 51,000km - Castrol 5w30
2006 Ford Falcon 4.0, 135,000km - Penrite Vantage 15w40, Ryco filter
Re: Water cooled bike and 5w-30 Syn oil? [Re: ZZman] #4671496
02/20/18 01:19 AM
02/20/18 01:19 AM
Joined: May 2012
Posts: 1,399
Georgia
AVB Offline
AVB  Offline
Joined: May 2012
Posts: 1,399
Georgia
I did a search, but I can't find a Penrite 5w30 that meets JASO MA. I am not saying that you are mistaken, I just wanted to read up on it but can't find anything.

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