MK4 2.0L Recommended Gearbox Oil & Diff Oil

Technical Area Engine, Transmission, Exhaust etc
1
  1. My model of MX-5 is: MK4 2016 2.0L Sport Nav
  2. I’m based near: Liverpool
  3. I’m looking for technical help or recommendations on: What is the best gearbox oil & diff oil.

What brands, quantities needed and where to buy.

2

I’ve had excellent results with Millers CRX 75w/90 NT+ and as the gearbox takes just over 2 litres you’ll need 3 litres and for the differential you’ll need 1 litre of Millers CRX LS 75w/90 NT+ for a .6 litre fill. Ford MTF XT-M5-QS for the gearbox also works well.

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3

Very happy with Motul Gear 300 75/90 in the gearbox. For the diff I only use genuine Mazda Long Life Hypoid SG1. If you decide to use anything else in the diff, please check the lubricant manufacturers website first. Many will not make a recommendation from their range and state words to the effect of “refer to technical for advice”.

4

I use Millers in both the differential and gearbox but have found the differential to be ~0.7L and the gearbox ~2.2L until they spill.

5

Hi There
Do you have to change the diff oil when doing the gearbox? Mazda specs say only if its been submerged in water for the service?

Thanks KP

6

No, you don’t have to. But its highly recommended as both the gearbox and differential run VERY hot. I do all of mine annually (engine, gearbox, differential) as I service the car myself its only the cost of the oil to me.