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Discussion Starter · #1 ·
Hi

It's been a while since I changed the oil in my CB650 and now I'm having trouble finding some SAE 10/40 mineral oil.

It's what I have always used and is the grade that was originally recommended but the closest I can find is 15/40 mineral oil for old motor cars. Will this be too thick for the Honda in the winter?

What grades of oil are others using please?

Cheers

Chris
 

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How cold is winter? My '98 Valkyrie manual says 20W is good down to nearly 32F, same for my '70 CB450. They show 10W is good down to about 5F. That would put 15W somewhere around 18F, which is way to cold for me to ride. I use 20W50 synthetic in my Valk, and 10W40 synthetic in my older Honda. I understand Rotella T6 5W40 would be good in colder weather, and is usually available at WalMart.
 

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Where are you that you can't find a good quality 10W40 motorcycle oil?

In the US you can get it at Walmart, at any motorcycle shop, any auto parts store..it's one of the most common types.

I'm sure the 15W40 will be fine too, but you shouldn't have a problem finding 10W40 if that's what you need. Make sure it's motorcycle type oil though, your CB 650 has a wet clutch I believe, if you use automotive oil with friction improvers it will ruin the clutch and make it slip.

Hi

It's been a while since I changed the oil in my CB650 and now I'm having trouble finding some SAE 10/40 mineral oil.

It's what I have always used and is the grade that was originally recommended but the closest I can find is 15/40 mineral oil for old motor cars. Will this be too thick for the Honda in the winter?

What grades of oil are others using please?

Cheers

Chris
 

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Just Crusin'
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29 Posts
Where are you that you can't find a good quality 10W40 motorcycle oil?

In the US you can get it at Walmart, at any motorcycle shop, any auto parts store..it's one of the most common types.

I'm sure the 15W40 will be fine too, but you shouldn't have a problem finding 10W40 if that's what you need. Make sure it's motorcycle type oil though, your CB 650 has a wet clutch I believe, if you use automotive oil with friction improvers it will ruin the clutch and make it slip.
OP may be having problems finding 10w40 without friction REDUCERS.

If you want to change your own oil/filter, you can also try locating a motorcycle shop near you. Ask for just the oil (my store will sell me bulk AMS cheaper than buying the quest bottles if I bring clean, dry gallon milk jugs) and they'll have it. Plenty of bikes in working condition use a wet sump, and friction reducers are a no-no, and they know it.
 

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I buy my AMSOIL 10W/40 Metric Motorcycle Oil at the local NAPA store. My 1988 Shadow 600 only takes 2.5 quarts and I change it @ 4K mile intervals so I don't consider the stuff to be expensive. I also use a NAPA Gold oil filter. My owner's manual specifies this viscosity for year-round use.
Just be sure to buy "motorcycle" oil when you buy synthetic as it has reduced additives so that your wet clutch operates like it should. Do NOT use automotive synthetic motor oil in a metric motorcycle.
 
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