10w-40 or 20w-50 - Suzuki GSX-R Motorcycle Forums Gixxer.com

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post #1 of 39 (permalink) Old 04-01-2011, 11:23 PM Thread Starter
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Exclamation 10w-40 or 20w-50

which oil should i run?? 10w-40 or 20w-50??
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post #2 of 39 (permalink) Old 04-01-2011, 11:28 PM Thread Starter
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Re: 10w-40 or 20w-50

im talking bout amsoil ... sry bout tht
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post #3 of 39 (permalink) Old 04-01-2011, 11:33 PM
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Re: 10w-40 or 20w-50

It's best to run 20/50 during very warm climates and 10/40 during the colder months. Being you live in Florida, I'd stick with 20/50. Especially if you keep the bike indoors. 20/50 often is more expensive, so think about that too.
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post #4 of 39 (permalink) Old 04-01-2011, 11:40 PM Thread Starter
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Re: 10w-40 or 20w-50

thanks, she is outside most of the time, now that is getting pretty warm in fl 20/50 sounds like is a good idea.
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post #5 of 39 (permalink) Old 04-05-2011, 04:27 PM
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Re: 10w-40 or 20w-50

Negative.... you are talking about AMSOIL it will be Product Code MCF which is 10W-40. The filter for all late Suziki's is EAOM-109.

20W-50 will cause lack of lubrication at start up, loss of HP and Fuel Mileage.

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post #6 of 39 (permalink) Old 04-05-2011, 04:34 PM
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Re: 10w-40 or 20w-50

Quote:
Originally Posted by Amsoil Dealer Group View Post
Negative.... you are talking about AMSOIL it will be Product Code MCF which is 10W-40. The filter for all late Suziki's is EAOM-109.

20W-50 will cause lack of lubrication at start up, loss of HP and Fuel Mileage.

Contact us for Forum Member pricing. No One beats our Direct pricing.

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Any documentation to hold this true?
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post #7 of 39 (permalink) Old 04-05-2011, 04:45 PM
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Re: 10w-40 or 20w-50

Yes. My 29 years of experience along with seeing many Dyno tests over that period.

A higher viscisity oil takes longer to pump to the moving parts... Lack of lubrication

A higher viscosity oil does not mean better protection. Film strength is what matters.

A higher viscosity oil than needed takes more HP to drive the pump.

A loss of HP due to any drag is an automatic loss of Fuel Mileage.

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post #8 of 39 (permalink) Old 04-05-2011, 05:24 PM
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Re: 10w-40 or 20w-50

I understand all your statements. But, were talking about extremely warm regions here. Example, Florida. I've been using 20/50 oil in all motors for nearly 20 years on all motors during the warmer months. Live in Pa and never had a problem with any of my engines. Due to lack of lubrication or any other internal problems for that matter. Yeah, if it was Febuary and the current temps are below lets say freezing. Obviously, you wouldn't want to have a higher viscosity oil than what the manufacturer suggests. And I'm not the only one who has done the same under the circumstance and never had any problems. All your statements change theory under warmer conditions.
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post #9 of 39 (permalink) Old 04-05-2011, 06:00 PM
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Re: 10w-40 or 20w-50

The question was specifically toward AMSOIL.

My answer was specifically about AMSOIL. There is no reason to use a higher viscosity than 10W-40. I have several race teams, that will punish their bikes far beyond the average rider will ever do. Not one, with Metric bikes, uses anything other than our 10W-40

When using a petoleum oil, everything changes.

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post #10 of 39 (permalink) Old 04-17-2011, 11:22 PM
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Re: 10w-40 or 20w-50

What about the older bikes? Like I have a 89 GSXR 1100 Air/Oil Cooled. I live in AZ where its starting to get 90 out. And later in the summer it be at around 110's. Would you still use the 10w - 40 or 20w - 50? I read above but I got a bike that 1 runs way hot plus outside temps are just as bad
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post #11 of 39 (permalink) Old 04-17-2011, 11:59 PM
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Re: 10w-40 or 20w-50

10W40 ALL the time. high or low rpm low or high temp 10w40 is what i use
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post #12 of 39 (permalink) Old 04-18-2011, 12:24 AM
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Re: 10w-40 or 20w-50

Quote:
Originally Posted by Tongan View Post
What about the older bikes? Like I have a 89 GSXR 1100 Air/Oil Cooled. I live in AZ where its starting to get 90 out. And later in the summer it be at around 110's. Would you still use the 10w - 40 or 20w - 50? I read above but I got a bike that 1 runs way hot plus outside temps are just as bad
If it were me. Living in Az and especially in an older bike. I would use 20/50. Unless your using Amzoil or another select few oils. Like the sponsor stated, some manufacturers include different additives to oils to enhance different lubricating aspects. Therefore with their specific oil, it might be best you stay at 10/40. With very warm climates and using some oils that aren't rated highly with those extra additives. I'd go with 20/50 during warm tempatures. All you have to do is look at your manual. If states at what temperatures it's safe or better recommended to use one of the two different viscosity oils depending on the current temperatures for the climate you live in. Not only will your manual state it, so will the back of every bottle of oil you will ever buy. One important consideration supposedly, is that an oil is wet clutch compatible on a motorcycle. Many people have been known to run oils that are not for thousands of miles and have never received any cluth slippage or failure. Myself included. In the end it all boils down to what you prefer and what you're willing to spend. Personally, I'd worry a little more about oil levels and interval changes in comparison to what brand oil I may choose.
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post #13 of 39 (permalink) Old 04-18-2011, 12:29 AM
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Re: 10w-40 or 20w-50

I guess i got to get me a manual then
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post #14 of 39 (permalink) Old 04-18-2011, 01:42 AM
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Re: 10w-40 or 20w-50

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Originally Posted by Tongan View Post
I guess i got to get me a manual then
You can download one on here for free. Use the search function to help you find it.
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post #15 of 39 (permalink) Old 04-18-2011, 05:54 AM
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Re: 10w-40 or 20w-50

If using AMSOIL, 10W40 is all you will need.

If using another, especially petroleum oil, 20W-50 for high heat and Be Sure to let it warm thoroughly before riding or even blipping the throttle.

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post #16 of 39 (permalink) Old 04-18-2011, 08:38 AM
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Re: 10w-40 or 20w-50

Ah i see. I'm using Valvoline Motorcycle oil... Wasn't my choice..
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post #17 of 39 (permalink) Old 04-18-2011, 10:40 AM
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Re: 10w-40 or 20w-50

I would use 10-40 on your bike as 20-50 is mostly use for the V-twin engines if I am correct . Amsoil is right .
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post #18 of 39 (permalink) Old 04-19-2011, 02:51 AM
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Re: 10w-40 or 20w-50

Suzuki have a chart in the owners manual that specifies what weight of oil to use based on temperature. 20w-50 is included for higher temperature ranges. Some 20w-50 oils are heavier than others. Mobil V-Twin is close to a 60 weight.

However Bob from Amsoil is recommending not to following Suzuki factory recommendations when using Amsoil.

Bob is Amsoil MCV a thick 50 weight?
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post #19 of 39 (permalink) Old 04-19-2011, 02:52 AM
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Re: 10w-40 or 20w-50

You could always go with Motul 5100 10w50. A very good oil.
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post #20 of 39 (permalink) Old 04-19-2011, 05:16 AM
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Re: 10w-40 or 20w-50

Quote:
Originally Posted by kwaka10r View Post
Suzuki have a chart in the owners manual that specifies what weight of oil to use based on temperature. 20w-50 is included for higher temperature ranges. Some 20w-50 oils are heavier than others. Mobil V-Twin is close to a 60 weight.

However Bob from Amsoil is recommending not to following Suzuki factory recommendations when using Amsoil.

Bob is Amsoil MCV a thick 50 weight?
All manuals are written with a CYA assuming that people will run the cheapest crap that they can find. Why anyone would spend thousands of $$$$ on something and then try to save $2.00 is beyond me but they do.

My recommendation is based on AMSOIL Only. Period.

10W-30 or 10W-40 AMSOIL in a Sportbike or Metric cruiser whether a 4 cylinder, 6 cylinder or V-Twin.

20W-50 is recommended in the manual as petrloeum oil will shear out of grade to a 40 wgt or less in high heat conditions.

AMSOIL M/C oils are actually made to where they will maintain a stable viscosity.

Yes, Motul 5100 is a good oil for a blend. Why not step up to 300V so at least you have the best Motul has to offer. AND, forget the 20W-50 !

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