Went into the Aberdeen Mazda dealer yester day to pick up some Mazda SG1 diff oil which is the only oil speced by Mazda for most post 2015 cars.
Advised that there is none in the Mazda Europe Stock and it will not be available until 15th November.
MX5parts have plenty in stock at virtually dealer price plus £6 for delivery the import straight from Japan re genueine Mazda parts.
Redline who produce the MT90 used by lots of people on the older 6 speed boxes have now advised that there 75W/85 GL5 gear oil is suitable for the MX5 ND Diff. Cost around £25.