Gearbox Oil Change

[jackmul94]

Hi all, bought a mk1 1991 mx5 about two weeks ago now and am not that fimiliar with them yet, got working on it yesterday and have replaced the clutch on it, I have the gearbox oil drained and was wondering whats the best oil for them and how much do they take??
Thanks in advance

[MX5Spares]

1 ltr approx .Use good quality synthetic gear oil if possible but standard gear oil like 85/90 works fine either way . Open the fill plud on side of box and fill it until it runs out.Also very small amount of any ludbricating oil in turret ( in gear lever hole)as it does not mix with the gear oil.Its only for oiling gear linkage.

[davith501]

1 ltr approx .Use good quality synthetic gear oil if possible but standard gear oil like 85/90 works fine either way . Open the fill plud on side of box and fill it until it runs out.Also very small amount of any ludbricating oil in turret ( in gear lever hole)as it does not mix with the gear oil.Its only for oiling gear linkage.

2l for gearbox? ~300ml turret? Correct me if I'm wrong!

[davith501]

Castrol 75W90 GL4 is very popular and works well with mx5 transmissions. Any haulfrauds should have it.

[jackmul94]

cheers lads for the advice. took just under 2L to fill the box, shes back on the road now.

[davith501]

Good to hear! Enjoy the weather!

[MX5Spares]

I use pump on 20ltr tin so I just fill to overflow so never exactly sure how much goes in.Once it flows out that good enough for me !!

[BAwagon]

How do You add the extra oil for an NB 6 speed. I mean the small amount oil You add from the top for the 5 speed? Thx in advance for advice!

[davith501]

6 speed transmission share same oil for turret and the gearbox so by topping it up from the top would fill it up. 5 speed ones gearbox and turret oil is separate. Make sure not to overfill it. 6 speed takes 2l.

[BAwagon]

THX !