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SOHC.co.uk Forums => CB750 => Topic started by: 1884dale on November 06, 2008, 07:01:34 PM

Title: should I use synthetic oil in my 750?
Post by: 1884dale on November 06, 2008, 07:01:34 PM

i have heard not to run synthetic oil in these old bikes (i have a k8)  is that true?

Title: Re: should I use synthetic oil in my 750?
Post by: Dave M on November 06, 2008, 08:08:32 PM

It's too good for them.

They were designed to run on good old 10/40 with frequent oil changes and that's what I use in mine and it's fine even after 30 years.

Whether synthetic would do any damage I don't know but I'm sure there's someone on here who knows...

Title: Re: should I use synthetic oil in my 750?
Post by: hector2800 on November 06, 2008, 11:51:31 PM

Didn't help my f2 much so I would stick with the 10/40 as recommended

Title: Re: should I use synthetic oil in my 750?
Post by: Bryanj on November 07, 2008, 03:49:16 AM

Not worth the cost as you still have to change it every 1500 miles

Title: Re: should I use synthetic oil in my 750?
Post by: 1884dale on November 07, 2008, 07:53:36 AM

thanks for the help

Title: Re: should I use synthetic oil in my 750?
Post by: Seamus on November 07, 2008, 02:05:14 PM

What are people generally using. I have some Silkolene 10/40 (possible semi synthetic) for motorcyles, should I use it? or look for something a little less modern like a classic 10/40 from morris or similar.

Thanks

Seamus

Title: Re: should I use synthetic oil in my 750?
Post by: Dave M on November 07, 2008, 03:12:11 PM

I use anything that's reasonable quality. It gets changed every 1000 to 1500 miles so it's not worth paying out too much.

I think the last lot I bought was Tesco's own and it's been fine!

Title: Re: should I use synthetic oil in my 750?
Post by: Voxonda on November 07, 2008, 04:30:48 PM

You can use the full synthetic, but may have the tendency to let the clutch slip! I recommend the 'normal' 10W40 from Castrol or Valvoline, never had any issues with it.
 

Title: Re: should I use synthetic oil in my 750?
Post by: Bryanj on November 07, 2008, 05:19:00 PM

Silkolene Transfleet 10w40 is exactly in the Honda spec if you can get it

Title: Re: should I use synthetic oil in my 750?
Post by: Spitfire on November 28, 2008, 07:30:09 PM

I still use Duckham's 20/50.

Cheers

Den

Title: Re: should I use synthetic oil in my 750?
Post by: BigAl (Alan) on February 04, 2009, 05:07:10 PM

Classic motorcycle mechanics (Feb 2009) did an article on the subject.
The conclusion is that the normal 10w40 oil changed as bike manufactures spec is fine.

Alan