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Old 10-24-2009, 10:01 AM   #1
tedrogers
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Mixing different grades of oil? >> 20w-40 + 15w-40?

Hi,

My FZ6 manual states that one of the recommended oils to use is 20w-40...and this is what is in the engine.

Can I top up the 15w-40 as I have some of this lying around? It meets all the various specifications so will it be okay to use? The only difference is it will cope with slightly lower temperatures than 20w-40.

Can you mix oils of different viscosities and will my FZ6 complain or suffer damage? It is only 3 months old.

Thanks.
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Old 10-24-2009, 12:44 PM   #2
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Re: Mixing different grades of oil? >> 20w-40 + 15w-40?

You are going to find conflicting opinions about this. I think generally it's ok, the main gripes I have found are not to mix oils of different brands as well as not mixing synthetic with non-synthetic oil. Otherwise I think it's fine.
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Old 10-24-2009, 12:49 PM   #3
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Re: Mixing different grades of oil? >> 20w-40 + 15w-40?

+1 on blitzcraig's comment...

As a really old guy told me when I was very young.... "some oil is better than no oil"

If I happen to have different grades of oil on hand when I change the engine oil... I'm not terribly concerned about that... if they are all within the range allowed by the manual, I don't see the harm.

Dino oil is a bell curve of different length molecules, which 'averages out' to the grade mentioned on the label. Some lighter, some heavier. You mixing in some stuff that is just very slightly different in characteristic (and still within the allowable scope) isn't going to do anything. Except lubricate your engine as designed.
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Old 10-24-2009, 02:56 PM   #4
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Re: Mixing different grades of oil? >> 20w-40 + 15w-40?

wont hurt anything.
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Old 10-24-2009, 03:34 PM   #5
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Re: Mixing different grades of oil? >> 20w-40 + 15w-40?

I sure hope it's OK. I know the manual calls for Yamalube 20w-40. The dealer had none when I went to get oil for my first change. They told me to use 20w-50. And that is what I have been using. I decided to try a synthetic/ mineral blend now that the engine has about 4000 miles on it. I live in Florida, so I can ride all year. I started thinking the 20w-50 was bit high for morning temps in the high 30's for Winter. I am going to use Motul 5100 for the next year. In the Winter I'll be using 2 qts of 10w-40 and 1 qt of 15w-50. In the Summer I will use use 2 qts of 15w-50 and 1 qt 10w-40. It is probably a bit eccentric, but it makes sense to me. I agree that it will be OK as long as you don't mix brands. But that is an opinion and I have no real experience to back it up. Ultimately, you can't go wrong by following the manual's specs. And obviously I am not. 10w-40 is also specified in the manual and it is available from all the oil vendors. I just feel Florida is too warm for too long to use it all year long. Though most of my research seems to show the 50 weight oil is geared for big V-twins and the 40 weight for smaller higher revving engines and such. The thing that sold me was Yamalube came out with a new synthetic oil in 15w-50, but it is too expensive! The 20w-40 isn't available anymore. At least not around here. The Motul isn't cheap, but it is about half the cost.
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Old 10-25-2009, 03:40 PM   #6
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Re: Mixing different grades of oil? >> 20w-40 + 15w-40?

Quote:
Originally Posted by danfree View Post
I sure hope it's OK. I know the manual calls for Yamalube 20w-40. The dealer had none when I went to get oil for my first change. They told me to use 20w-50. And that is what I have been using. I decided to try a synthetic/ mineral blend now that the engine has about 4000 miles on it. I live in Florida, so I can ride all year. I started thinking the 20w-50 was bit high for morning temps in the high 30's for Winter. I am going to use Motul 5100 for the next year. In the Winter I'll be using 2 qts of 10w-40 and 1 qt of 15w-50. In the Summer I will use use 2 qts of 15w-50 and 1 qt 10w-40. It is probably a bit eccentric, but it makes sense to me. I agree that it will be OK as long as you don't mix brands. But that is an opinion and I have no real experience to back it up. Ultimately, you can't go wrong by following the manual's specs. And obviously I am not. 10w-40 is also specified in the manual and it is available from all the oil vendors. I just feel Florida is too warm for too long to use it all year long. Though most of my research seems to show the 50 weight oil is geared for big V-twins and the 40 weight for smaller higher revving engines and such. The thing that sold me was Yamalube came out with a new synthetic oil in 15w-50, but it is too expensive! The 20w-40 isn't available anymore. At least not around here. The Motul isn't cheap, but it is about half the cost.
5100 is fine.... Run it in all my bikes and I'm farther south than you...
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Old 10-25-2009, 09:37 PM   #7
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Re: Mixing different grades of oil? >> 20w-40 + 15w-40?

Quote:
Originally Posted by danfree View Post
I sure hope it's OK. I know the manual calls for Yamalube 20w-40. The dealer had none when I went to get oil for my first change. They told me to use 20w-50. And that is what I have been using. I decided to try a synthetic/ mineral blend now that the engine has about 4000 miles on it. I live in Florida, so I can ride all year. I started thinking the 20w-50 was bit high for morning temps in the high 30's for Winter. I am going to use Motul 5100 for the next year. In the Winter I'll be using 2 qts of 10w-40 and 1 qt of 15w-50. In the Summer I will use use 2 qts of 15w-50 and 1 qt 10w-40. It is probably a bit eccentric, but it makes sense to me. I agree that it will be OK as long as you don't mix brands. But that is an opinion and I have no real experience to back it up. Ultimately, you can't go wrong by following the manual's specs. And obviously I am not. 10w-40 is also specified in the manual and it is available from all the oil vendors. I just feel Florida is too warm for too long to use it all year long. Though most of my research seems to show the 50 weight oil is geared for big V-twins and the 40 weight for smaller higher revving engines and such. The thing that sold me was Yamalube came out with a new synthetic oil in 15w-50, but it is too expensive! The 20w-40 isn't available anymore. At least not around here. The Motul isn't cheap, but it is about half the cost.
If you change your oil every 3K miles and only street ride (no racing) you could use Crisco cooking oil and it would be ok. Just use any major brand name oil and you will be fine. I generally wouldn't mix different weights of oil unless you are just topping it off before you change it next time, though.
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Old 10-25-2009, 10:44 PM   #8
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Re: Mixing different grades of oil? >> 20w-40 + 15w-40?

15/40 and 20/40 are likely the same base fluid, as long as you're not mixing mineral and
synthetic as discussed, modern multi-viscosity oil starts life the same way and the properties
are changed by adding different polymers (microscopic plastic strands) that change shape
when warmed thus altering viscosity, a higher rated viscosity oil will have more/different
polymers than the lower one but otherwise be the same fluid and there should be no mixing issues
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Old 10-26-2009, 03:59 AM   #9
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Re: Mixing different grades of oil? >> 20w-40 + 15w-40?

You can mix oils,

You can mix all types of oils, even synthetic, how do you think they get synthetic blends.

Amsoil states on their website that their oils are compatible with mineral oils, you just lose some of the benefits of running a synthetic. Even Motul and Redline POE ester oil can be mixed with conventional oil. Your bike will be fine, and as someone else posted, any oil is better than no oil.
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Old 10-26-2009, 09:27 AM   #10
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Re: Mixing different grades of oil? >> 20w-40 + 15w-40?

Quote:
Originally Posted by speedfrk View Post
If you change your oil every 3K miles and only street ride (no racing) you could use Crisco cooking oil and it would be ok. Just use any major brand name oil and you will be fine. I generally wouldn't mix different weights of oil unless you are just topping it off before you change it next time, though.
How about Blue Bonnet margerine---would that be okay if I ran that in my FZ6 crankcase? This won't affect the warranty...or will it?
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