Diff / Transmission Oil

Technical Area Engine, Transmission, Exhaust etc
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  1. My model of MX-5 is: 2.0L ND1
  2. I’m based near: _Glasgow
  3. I’m looking for technical help or recommendations on: the diff oil/transmission oil.
    I’ve been through various forums and posts on this website.

I hate starting another thread but there’s quite a few recommendations on the oil to use.

Castrol Transmax Universal 75W-90 1L : Amazon.co.uk: Automotive - Castrol Transmax Universal 75w 90
Castrol Transmax Manual Multivehicle 75W-90 1L : Amazon.co.uk: Automotive - Castrol Transmax Multivehicle 75w 90

Would these be fine to use? Figured the transmission and diff oil has never been changed (picked the car up last year) and now around 43k miles so want to get this done ASAP.

Cheers.

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The second link, multivehicle, if you’re going the Castrol route for the gearbox

For the diff, use Mazda’s juice

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Put this in my diff,

1000000816
1000000816992×1945 99.2 KB

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Put this in my gearbox 50/50 mix of redline mt90 and lightweight shock

1000000820
1000000820820×1534 101 KB

1000000818
1000000818971×1526 98.9 KB

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I’ve used these with excellent results
Gearbox
Millers CRX 75w/90 NT+ (3 ltr for 2.2ltr fill)
Diff
Millers CRX LS 75w/90 NT+ (1ltr for .6ltr fill)

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Thanks for the input. Might try the millers. It popped up quite a bit on other threads as well.

Pray for me :joy:

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Those choices are fine…
Order
1 x 1ltr bottle for the diff in your first link. 2 x 1ltr bottles for the gear box in your 2nd link.
Make sure it’s to spec GL4 for the gear box whatever choice you make re brand.

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Ah, a fellow over-thinker…

Don’t forget the crush washers

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This actually made me laugh out loud. :sob::joy:

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