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Author Topic: What oil should I use for a CB750 K8?  (Read 8315 times)

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Offline keaton_taylor

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What oil should I use for a CB750 K8?
« on: September 25, 2011, 05:40:05 PM »
Thoughts my friends?
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72500john

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Re: What oil should I use for a CB750 K8?
« Reply #1 on: September 25, 2011, 05:47:43 PM »
not an expert but use something with zinc in it..20w50? ithing rottella still has it.
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Offline MCRider

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Re: What oil should I use for a CB750 K8?
« Reply #2 on: September 25, 2011, 06:02:28 PM »
Popcorn anyone?   ;D
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Offline scottly

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Re: What oil should I use for a CB750 K8?
« Reply #3 on: September 25, 2011, 06:03:52 PM »
Quote from: MCRider on September 25, 2011, 06:02:28 PM
Popcorn anyone?   ;D
LOL! You beat me to it! ;D ;D
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Offline wrenchmuch

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Re: What oil should I use for a CB750 K8?
« Reply #4 on: September 25, 2011, 06:15:44 PM »
NO NO NO NO ! YES !  ;D I love oil posts . Use motorcycle specific oil for wet clutches . Change it regularly .
« Last Edit: September 25, 2011, 06:18:38 PM by wrenchmuch »
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Offline TwoTired

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Re: What oil should I use for a CB750 K8?
« Reply #5 on: September 25, 2011, 06:17:03 PM »
What? No Owner's Manual?
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Offline Trav-i

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Re: What oil should I use for a CB750 K8?
« Reply #6 on: September 25, 2011, 06:33:43 PM »
I think I'm gonna duck before the *&!t starts flying!
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72500john

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Re: What oil should I use for a CB750 K8?
« Reply #7 on: September 25, 2011, 06:38:01 PM »
look guys i think this guy just wants an honest answer not alot of extra comments. help him out would ya!!!
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Offline BobbyR

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Re: What oil should I use for a CB750 K8?
« Reply #8 on: September 25, 2011, 06:39:24 PM »
Quote from: 72500john on September 25, 2011, 06:38:01 PM
look guys i think this guy just wants an honest answer not alot of extra comments. help him out would ya!!!
I would suggest the best help he can get is do a search. Oil has been beat to death.
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Offline chopped550

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Re: What oil should I use for a CB750 K8?
« Reply #9 on: September 25, 2011, 06:46:20 PM »
not sure about yours, but my oil dipstick cap says the oil weight right on it.
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Offline nccb

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Re: What oil should I use for a CB750 K8?
« Reply #10 on: September 25, 2011, 07:16:09 PM »
i just use 10w40 but make sure there are NO friction modifiers.  I haven't had my bike long enough to try a different weight to tell you if there is a difference or not but everyone says they will make your clutch slip if there are friction modifiers or lighter.
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Offline keaton_taylor

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Re: What oil should I use for a CB750 K8?
« Reply #11 on: September 25, 2011, 07:42:12 PM »
I get 10w 40 motorcycle only, I was wondering if there was a brand that was better for the late sohc's for whatever reason, I'll do a search.
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Offline Danno

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Re: What oil should I use for a CB750 K8?
« Reply #12 on: September 25, 2011, 09:56:35 PM »
regular castrol oil in 10/40 is as close as it comes to the original oil for these bikes or you can pay twice as much from a honda dealer but young guys on the sales floor will try to sell you the wrong oil
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Offline bjatwood

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Re: What oil should I use for a CB750 K8?
« Reply #13 on: September 26, 2011, 05:08:03 AM »
I just put some Rotella T 15w-40 in mine this weekend. So far so good.
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KingCustomCycles.com

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Re: What oil should I use for a CB750 K8?
« Reply #14 on: September 26, 2011, 06:22:25 AM »
If you use anything but Rotella 15w40, you are simply wrong. ;-)
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Offline BobbyR

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Re: What oil should I use for a CB750 K8?
« Reply #15 on: September 26, 2011, 06:36:58 AM »
If we keep responding the these Oil threads we are morons. There are probabl;y 100 pages on Oil out there. 
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KingCustomCycles.com

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Re: What oil should I use for a CB750 K8?
« Reply #16 on: September 26, 2011, 07:18:01 AM »
It is all in good fun.  Oil just seems to get things moving. :-)
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Offline BobbyR

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Re: What oil should I use for a CB750 K8?
« Reply #17 on: September 26, 2011, 07:27:08 AM »
Quote from: KingCustomCycles.com on September 26, 2011, 07:18:01 AM
It is all in good fun.  Oil just seems to get things moving. :-)

Mineral Oil keeps things moving.   ;D ;D ;D ;D
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Offline Deltarider

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Re: What oil should I use for a CB750 K8?
« Reply #18 on: September 26, 2011, 07:29:38 AM »
Enjoy it while you can... 'cause we run out of it.
If you are not riding in the freezing cold, 15w-40 is the better oil.
In summer temperatures I would even consider 20-40. Remember: first generation multigrade oils were 10-30 for wintertime and 20-40 in summer. In those days people would change oil twice a year. That's not necessary at all now and a waste. Remember the former managing director of Castrol (Netherlands) I introduced in a previous post who himself never changed his oil?
« Last Edit: September 26, 2011, 07:32:28 AM by Deltarider »
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Offline OldSchool_IsCool

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What oil should I use for a CB750 K8?
« Reply #19 on: September 26, 2011, 07:30:49 AM »
I used to use Spectro, but it caused the world economy to collapse. Things are better now that I switched to Rotella.

I did recently switch to DOT4 brake fluid, but then there was an East Coast earthquake. Sorry about that guys!!
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Re: What oil should I use for a CB750 K8?
« Reply #20 on: September 26, 2011, 08:12:34 AM »
Dot4 will gum up your carbs if left in the crankcase too long.  I don't recommend it except as an additive in warm weather ???
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Offline MCRider

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Re: What oil should I use for a CB750 K8?
« Reply #21 on: September 26, 2011, 08:26:46 AM »
Quote from: KingCustomCycles.com on September 26, 2011, 08:12:34 AM
Dot4 will gum up your carbs if left in the crankcase too long.  I don't recommend it except as an additive in warm weather ???
Notice how NO ONE talks about DOT5, which by the way makes a great chain lube.
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Offline OldSchool_IsCool

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What oil should I use for a CB750 K8?
« Reply #22 on: September 26, 2011, 09:43:45 AM »
DOT5 doesn't exist!  It's a myth like Big Foot, alien abductions and bi-partisanship!
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If you take care of it.
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Offline Rgconner

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Re: What oil should I use for a CB750 K8?
« Reply #23 on: September 26, 2011, 10:03:56 AM »
Quote from: KingCustomCycles.com on September 26, 2011, 06:22:25 AM
If you use anything but Rotella 15w40, you are simply wrong. ;-)

Delvac 1300 or GTFO!


Seriously, I suggest trying different oils that are made for wet clutch. Find one you like and one the bike likes. Remember, change interval is 1500 miles, or about 4 weeks for me, so I have tried a few.

The Grease Monkey really likes Delvac 1300, shifts like a dream and I can hit neutral every time.

(I topped off last weekend with some Lucas that is really for the Vespa, but I was out of Delvac. Seems to really like that combo, it quieted down some of the chain clatter)

Rotella? Shifting is really heavy, but neutral is easy to find like Delvac (15-40)

Castrol 4T? shifts like crap, can't find neutral. Really clattery too. Expensive compared to Delvac and Rotella that I can get for ~$14 for a gallon at Wally Mart

I suspect that this is all a unique combo of wear, oil pump effectiveness, and "personality" that these bikes exude. They are all unique... like little snowflakes.  ::)

So run a few different brands through the bike, see what feels the best.

Then use that.


« Last Edit: September 26, 2011, 10:05:30 AM by Rgconner »
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