gearbox and differential oil

stevesports · Postby **stevesports** » Mon Mar 10, 2008 7:44 pm

Hi guys,

how do i know if i need to change my gearbox and differential oil? I have no idea when my car had its box and differential oil has last been changed so i guess i'm looking for any cues. It's a 01 NB8B with 77k kms

wun911 · Postby **wun911** » Mon Mar 10, 2008 8:19 pm

IIRC its around the 70k or 80k mark according to the users manual.

Just do it on doggy day its in a few weeks.

Bring a pump bottle to pump the liquids in.

When you jack up the car it should be level so you fill it up correctly (bring some jack stands if you can).

I have all the sockets you need and a long breaker bar for us week nubes. (undo the fill plugs before you undo the drain plugs).

Garry · Postby **Garry** » Mon Mar 10, 2008 8:24 pm

Bring a pump bottle to pump the liquids in...

Or a 1.2m length of 12mm garden hose and a funnel to poor the liquids in. Much easier and quicker

stevesports · Postby **stevesports** » Mon Mar 10, 2008 8:24 pm

yeah but it also says every 4 years or so, whichever sooner, so i have a feeling it has been changed. In any case you're right. Are gearbox and diff oil different? also do i need some sort of specialist pump bottle? i don't have any of that at home.

also, where do i get the oils and what viscosity?

wun911 · Postby **wun911** » Mon Mar 10, 2008 8:29 pm

oh you may want to get the rubber upper and lower shift boot things. They are only like 30 bucks or so. I remember mine were torn to shreds...

Hellmun · Postby **Hellmun** » Mon Mar 10, 2008 9:19 pm

http://www.miata.net/garage/6mt_fluid/index.html

stevesports · Postby **stevesports** » Mon Mar 10, 2008 9:39 pm

so um, what would be a good oil for the diff and the box? also where would i get it?

zoomzoom · Postby **zoomzoom** » Mon Mar 10, 2008 9:57 pm

IIRC EPX 80W-90 for the diff, about 900mL-1L for torsen and I thnk around double that for an open diff.

And I think a straight 80 gear oil for the box, or a 75W-90 synthetic. I used penrite full syn 75W-90 in mine, shifts quite smoothly. It took a little under 2L from memory.

Tim

Postby **Okibi** » Mon Mar 10, 2008 10:11 pm

Garry wrote:Or a 1.2m length of 12mm garden hose and a funnel to poor the liquids in. Much easier and quicker

Get quality pump bottle with a metal hooked end, I recon its a lot easier than trying to use a hose and funnel.

stevesports · Postby **stevesports** » Mon Mar 10, 2008 10:18 pm

ok cheers. How much would this all cost? i figure that i will need 3 litres of the stuff (2 for the box, 1 for the open diff) going by miata.net's fluid change guide.

zoomzoom · Postby **zoomzoom** » Mon Mar 10, 2008 10:22 pm

Open diff will likely take more than 1L from memory. I think depending on the shop and brand, gear oil is around 12.50 a litre or so.

TieNN89 · Postby **TieNN89** » Mon Mar 10, 2008 10:40 pm

Okibi wrote:
Garry wrote:Or a 1.2m length of 12mm garden hose and a funnel to poor the liquids in. Much easier and quicker

Get quality pump bottle with a metal hooked end, I recon its a lot easier than trying to use a hose and funnel.

has anyone tried the drill pump

i saw it at autobarn when i was after a pump

not sure how good it was but I'm sure it wouldnt' be as tiring as using one of those hand pumps