As above all fine before now wont shift into neutral when I topped it up. Neutral ok when stopped Beware! 

put it into neutral before coming to a sop then Simon...rather than waste the oil?

Really!

Obviously its the own brand 80/90 heavy duty gear oil? Or could be their fully synth car 10/30 oil?

Without the detail this thread is pointless.

 

Ok gone to find the bottle. Original is castrol power 1 10w-40 4t. Halfords is 10w/40 4 stroke motorcycle part synth engine oil. 

Neutral was fine 7 days ago. Clutch drag  now I expect. 

Sounds like the correct oil,  is it different when warmed up. ?

And I always tap into neutral on way down to a stop,

Cant even tap it down. Have to stay in first at lights. 

So you cannot get down into first?

33 minutes ago, Simon46 said:

Cant even tap it down. Have to stay in first at lights. 

my point was....when coming to a stop go from 2nd to neutral while still moving, not go down to 1st, theres no need to go to 1st until setting off again.

Well drained it put the castrol power1 oil back in all is well after 10 miles. I didnt think it would be that fussy!