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1979 to 1983 DOHC CB750/900/1000/1100 Honda Custom: Forums

WWW.CB750C.COM :: View topic - Cb900c engine oil preference

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This Just In
This Just In

Joined: Nov 23, 2014
Posts: 1
Location: Calhoun GA

PostPosted: Sun Nov 23, 2014 6:15 pm Reply with quote Back to top

What types of oil are recommended
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Joined: Aug 01, 2007
Posts: 24633
Location: Spending the Summer in Michigan .

PostPosted: Sun Nov 23, 2014 6:36 pm Reply with quote Back to top

Welcome to the site Butcher ... Smile

If you haven't read the following page , now is the time .

If you run into problems with any of that , Please let us know . Thanks . Smile

sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :

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Checklist :
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Every man makes his own chains .
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A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
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1982 CB750C - Sold > Looking for my next one .
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Joined: Sep 27, 2009
Posts: 13632
Location: ABQ, NM, USA

PostPosted: Sun Nov 23, 2014 6:56 pm Reply with quote Back to top

Welcome here Butcher

Please be sure to visit the New Members Thread and fill in your signature. Lots of common questions you might have will be answered there as well as how to get the most from this site. A link to it is located in my signature. Smile

The topic has been discussed to death really. Try a search using the instructions on how to search that is provided in the New Members Thread. Use words like Rotella and Castrol and that will bring up some spirited discussions and no doubt you will have plenty of options to choose from.

I have used Rotella 4T 15W40 diesel oil and right now I use Castrol 4T motorcycle oil 20w50. Both have been good for me but the Castrol is a better warm weather oil which means nothing right now but I am still in spec.

Hope this gets you started Smile



1981 CB900 Custom

New Members Thread. Learn how to use the search engine, post proper sized pictures and get answers to very common questions that have been asked numerous times: Click Here

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Joined: Jul 25, 2007
Posts: 37014
Location: ridge road springfield nova scotia

PostPosted: Sun Nov 23, 2014 8:11 pm Reply with quote Back to top


On a steel horse i ride

People are just as happy as they make up their
minds to be.” ― Abraham Lincoln
85 kz1100 ltd
Paint gelding
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Power Poster
Power Poster

Joined: Nov 20, 2012
Posts: 2675
Location: Tallahassee, Florida

PostPosted: Mon Nov 24, 2014 5:40 am Reply with quote Back to top


My Current Bikes: 2005 HD Electra Glide

Former Bikes: 1981 CB900C, 2006 Suzuki DR200SE, 1994 BMW K1100LT, 1983 HD XLH Sportster, 1981.5 CB900C, 1973 Suzuki TS100. 1980 CB750C, 1980 GL1100 Goldwing, 1989 Suzuki Katana 750, 2 Suzuki JR50´s, 1981 Honda CB650, 1982 Honda CB900C, 1982 Yamaha XJ550 Maxim, 2001 Yamaha V-star, 1980 Yamaha 400, 198? Suzuki Madura, 1974 Triumph T140E, Yamaha PW50, 1984 VF500F Interceptor, 1980 Honda CB900C, 2014 HD Electra Glide.
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Joined: Jul 24, 2007
Posts: 43748
Location: Studio City, CA

PostPosted: Mon Nov 24, 2014 9:16 am Reply with quote Back to top

Welcome to here wave

NMT wrote:

If you do a lot of short trips or haul ass canyon rides, or city freeway rides, with lots of hot/cold cycles, oil changes should probably be done at closer to 2000 miles or less, regardless that the book says 4000 miles. These air cooled motors can totally contaminate the oil much quicker than 4000 miles. Some guys even say to change it every 1000 miles. Personally, I smell and feel the oil. Once it starts to stink like exhaust and gas, or show any other contamination like water, I figure it's time for a change. Running it past that point is asking for premature wear. You can also rub it between your fingers and begin to feel some fine grit. Even though there is still plenty of viscosity left, the oil is too contaminated for the filter to get it out, and that stuff is wearing inside your motor like rouge.

Longer continuous rides, like 5 days of 700 mile days or so, can probably be done on one oil change, but keep an eye on the oil level, it will probably eat a little oil. Be sure to feel and smell the oil every morning before you start out to make sure the oil hasn't turned into liquid polishing compound or is thinned out like WD40.


Be sure to use JASO MA rated oil.

NMT - New Member's Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

For Honda Shop Manuals (FSM), Click Here.
Click here to go fiche at Parts Pit Stop.
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Be sure to use Copper Anti-Seize on your Spark Plug Threads!
To Fix and Better Understand Your DOHC Honda Charging System, Click Here.

81 CB900C, 83 CB1000C
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