DIY: Transmission Oil Change

JARblue

If I had to guess, I bet the differential drain plug is the same as the transmission drain plug. Since the differential drain plug already has a magnet, you could probably just get a second one and use it on the transmission. I'm not absolutely sure they are the same, though

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kenchan

do you guys see that much metal shavings in your MT fluid?

when i did my G's at 34K miles it didn't have much shavings in there and the
fluid was clean.... anyway, thanks for confirming the gasket 11026-4N200
for the Z. now i know it's the same as my G. diff and tranny.

wdkwang

Just figure it's time to for some long-term insurance. Just did the diff fluid again last week and cleaned off the shavings off the stock magnetic drain plug. It's a good amount of shavings each time. I'm getting a magnetic one for the oil pan just to see what's up in there, and figure I might as well get one for the tranny if there is one for it.

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juld0zer

Magnetic drain plug for 6MT gearbox



most of the particles collected at my last trans oil change was actually suspended in the oil - brass particles it seems

juld0zer

so you'd be better off filtering the oil than trying to attract it because brass
doesnt appeal to magnets

onzedge

They are the same.

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juld0zer

i've never taken apart the gearbox but my first thought about using a diff drain plug in the gearbox is that there could be clearance issues with internal components as the diff plug is quite long

rgunho

I changed my Dif and Trans fluid at the same time. I used Lucas 75-90w Syn for both. After jacking up the car, the rear was only slightly higher than the front.

I got about 2.75 quarts out of the Tranny and it took about 3 to refill.

I only got about 1.4 quarts out of the Diff and it took about 1.9 quarts to refill.

Does any of the oil get by the seals or burn up and any way? Just wondering why they seemed to be low on fluid? Car just hit 30k.

1325

For future reference, I'd use a GL-4 specific transmission fluid as GL-5 (Lucas 75W-90) will deteriorate our transmissions' brass synchros. I use Red Line MT-85.

juld0zer

my only guess is that the car was not perfectly level when you did it?

or your measuring devices are a little off. any leaks should be obvious and oils of this viscosity should not burn up under normal operating temps in their applications

aszyd

Yup. You might want to swap over to the MT-85, referenced above, ASAP.

Also, 1.5 QTs is the correct amount for the diff, if you truly do have 1.9 in there, you might want to put the car back up, level, and see if any will leak out of the fill hole.

The trans will take 3QTs with no problems.

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JARblue

That's not right

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dkmura

"Not right" is putting it mildly. By using a 75-90W diff fluid in your tranny, you've exposed the brass components in your six-speed tranny to high-pressure elements needed in a differential. But those same chemicals are caustic to softer metals like those found in the tranny, and can etch and damage them and the seals. Worse yet, it's easy to see this type of damage when you take it back to the dealer, who will then void your warranty. Hate to see a perfectly good Nissan Z tranny damaged by owner ignorance...

rgunho

Thanks guys! I guess I'll put her back on the blocks and do it again. : (

rgunho

So, Lucas tech support agrees with y'all that the fluid is to vicious for yellow metal. They told me to drain half the oil and add Lucas Synthetic oil conditioner. The 50/50 mixture would be a GL-4. Any thoughts?