SOHC.co.uk Forums > CB350/400

Fork Oil Weight?

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Skoti:

--- Quote from: McCabe-Thiele (Ted) on June 03, 2024, 10:24:35 AM ---
--- Quote from: Johnwebley on June 03, 2024, 09:53:29 AM ---I use ATF,

Basic Dexron,as my car used it,

Nice even,smooth feeling when riding,



Sent from my SM-A546E using Tapatalk

--- End quote ---

When you say basic Dexron is that 1,2, or 3 all old specs pre- synthetics?

--- End quote ---

The newest ATF Dexron oil is backward compatable. Anything that took Dexron II will now take Dextron III.
All oils of the same grades are designed to be mixed as per industry standards.

McCabe-Thiele (Ted):

--- Quote from: Skoti on June 03, 2024, 10:41:12 AM ---
--- Quote from: McCabe-Thiele (Ted) on June 03, 2024, 10:24:35 AM ---
--- Quote from: Johnwebley on June 03, 2024, 09:53:29 AM ---I use ATF,

Basic Dexron,as my car used it,

Nice even,smooth feeling when riding,



Sent from my SM-A546E using Tapatalk

--- End quote ---

When you say basic Dexron is that 1,2, or 3 all old specs pre- synthetics?

--- End quote ---

The newest ATF Dexron oil is backward compatable. Anything that took Dexron II will now take Dextron III.
All oils of the same grades are designed to be mixed as per industry standards.

--- End quote ---

That is true for use in an automatic gearbox - not sure if the different grades are the same viscocity though and what the temperature gradient might be?
I do know they have more plasticisers in the later grades - there must be however some performance differences in the oil itself. Hard to find actual viscocity rating - might be 5W depends where you look some are a 5W/10.
https://en.wikipedia.org/wiki/DEXRON#2005_-_DEXRON-VI_(J)

Skoti:
Ted,

I'm getting well out my depth here, maybe we have an oil expert on this forum that can answer your questions?

Anyhow the lubrication requirements of our old Honda forks are probably far less than that of modern automatic transmission systems.
So maybe the latest spec ATF should be more than adequate for us.


 

Bryanj:
The main reason for using ATF is that it supposedly does not froth when pumped which hapens a lot in forks.
When Mr Honda designed these bikes ATF was about the only oil with this property, specialist fork oils did not exist.
My opinion is use any ATF as the specs wont matter to what it is being used for OR use specialist fork oil but as to what grade now that depends on the owners weight, how it will be ridden and level of comfort required, i seem to remember 7 worked out about same as ATF

McCabe-Thiele (Ted):
On automatic gearboxes the older Dexron grades took longer to change gear at optimal times until they had reached a normal working temperature assisted  by a shared radiator oil cooler arrangement.

Be interesting if this is reflected in it's use on a motorbike are they firm when cold becoming softer after a few miles.

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