SOHC.co.uk Forums > CB500/550

Oil !!!!

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TezzerTel:
I'm sure this has been ased a thousand times already but!!!!

I thought these bikes required mineral oil but I'm struggling to find mineral oil that's motorcycle specific? So do I go for non motorcycle mineral oil, semi synthetic motorcycle oil or keep looking!

Johnwebley:
I use 10-40 semi synthetic

Either Mannol
Triple Q,from euro car parts

In the past I have used Mobil one,0-40 full synthetic

My bike has done 80k+

And the wear is negligible

Sent from my SM-A546E using Tapatalk

McCabe-Thiele (Ted):
If you see Mineral Oil that is 10W/40 that's all that matters, it does not need to say Motorcycle Oil specifically on the can. Like John says an oil sold as semi-synthetic is also fine.  I suspect that the cheaper stuff sold by Asda & other brands is lower in the semi-synth content. The real key is regular oil change routines.

For many decades manufacturers have lost the after market sales for oil now they are fighting back.
The level of Pseudo-Science marketing now embarked upon by manufacturers is beyond a joke.

My Volvo handbook implores me to use only Volvo Engine Oil for topping up - it retails at around £22 for a LItre of 0W/20 that is made by Castrol for Volvo. They then add the specification must meet the Volvo  VCC-RBSO-2AE 0W/20 specification, call me cynical but I suspect when they are filling the bottles for Volvo it comes out of the same tank as Castrol Edge 0W/20 that they also sell to BMW etc.

The idea that each make of car needs a specification of 0W/20 plus a row of meanigless letters after its name is absolute nonesense imho. At one time it was the same with ATF oils but these days that falsehood has ended.

When Merc sold the original Smart Cars the oil they sold that was supplied soley to MB was in a Castrol Branded container, they marketed it as Castrol Longtech - at that time sold it exclusively to MB. It was not available outside the dealer network. Boy did the Smart Car owners complain about the oil cost on a service. On Mercs in the event of an engine failure our workshops had to send a sample of the engine oil to MB for analysis before they would meet the warranty payment to the dealer.

Murf:
10w40 mineral motorbike oil is hard to find now, I and many other CBX 1000 owners use Valvoline 20w50 VR1 Racing mineral oil, however the original spec was a 10w40 oil same as the 550 and just about every other  Honda at the time.  There was just oil no special motorbike oil back in the day and I always used Castro GTX. 
The problem with the CBX and Semisynthetic oil is the clutch which can tend to slip, however if the friction plates are changed to a more modern material then the problem goes, so some owners do now use semisynthetic oil with seemingly no problem.   

A problem with a part synthetic oil could be bore glazing on a lightly used classic bike engine, I see a simple answer to that, Don’t Ride like a Pussy, they like a bit of a thrash😄
I know this answer isnt SOHC specific but I think the same thing with engine oil apply to most classic Hondas.

Bryanj:
Look at diesel engine 10w40 mineral oils, they usually meet the 70's sae specs for the Hondas

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