I have a 99 Nissan Almera which occasionally grinds / doesn't engage when I try and put it into fifth gear. Not often, but maybe once or twice a day.
I'm not sure if the problem is operator related, or a potentially clutch problem since it only happens occasionally and only when going into fifth.
Do manual clutches need oil and filter changes occasionally like automatics? Would you ever use something like Lucas Transmission Fix or a similar type product on a manual?
I haven't dealt with this issue yet, but I was talking to someone about changing the gear oil since I'm going to replace the cv boots. The Hayens manual says my tranny takes
Hypoid gear oil, viscosity SAE 80W to API GL4. This person recommended that I use Valvoline 75w-90 Limited Slip to help with the problem I'm having shifting into fifth gear.
According to the product information sheet on Valvolines website it meets GL4,GL5 and MT1 ( whatever those are ).
What is this "limited slip" thing they are talking about and might it help my problem, as opposed to refilling with some cheaper oil like regular 75w-90 or 80w?
Got some interesting responses to this on BobIsTheOilGuy.
Crap, the Red Line site says
MTL, MT-85 & MT-90 are not for use in differentials with hypoid gears
I've gotta check the workshop manual to see if what's said in the Haynes is correct...
EDIT March 15, 2021
The fifth gear eventually got to the point where I could only engage it if I was going downhill at a particular speed - then eventually it would go into gear then pop out of gear as soon as I gave it any gas... But hey - gears 1-4 still work great and the engine is still like new! :-) Also, changed the gear oil a few years back and put 10-w40 engine oil in it I think...