mr brg educate me! Gear Oil

[POS Racing]

Is the Pennzoil Synchromesh fluid the same as the General Motors Synchromesh fluid?

Nope I think all they share is a common name.

But this stuff rocks! I still haven't changed it yet been in it for over 6 months and still 100% pleased with the results! Thanks again mr brg!

[SirHustlerEsq]

Nope I think all they share is a common name.

But this stuff rocks! I still haven't changed it yet been in it for over 6 months and still 100% pleased with the results! Thanks again mr brg!

They're different, the GM version has a higher CST score at 100*c.

[MoonieGT]

I had good results in my '91 switching from whatever the PO had in the car to Motul. I have some sitting in the garage for my '99 but I have not had a chance to swap oils yet... I'm surprised no one mentoined Motul in this thread. Have people moved on to better things?

[ray_sir_6]

Motul.

[SirHustlerEsq]

Motul.

lol @ GL5 in a yellow-metal trans.

[ray_sir_6]

I ran Motul in my 5-spd for 30k miles, and have it in the 6-spd currently. What is the issue?

[MoonieGT]

Ya, am I not supposed to use Motul in my '99?

[SixAce]

I ran Motul in my 5-spd for 30k miles, and have it in the 6-spd currently. What is the issue?

Ya, am I not supposed to use Motul in my '99?

Everyone knows your car will asplode.

[ray_sir_6]

Everyone knows your car will asplode.

Hasn't happened yet, and that's all I have ever ran in my Miata. Maybe that is why my 5-spd tranny didn't pop with 261 whp.

[modernbeat]

Motul (a GL5 oil) is good for the gears and bearings, but it's bad for the syncros and makes shifting unpleasant. Read this entire thread and you'll understand why you want a GL4 oil in your transmission. And the current leader in GL4 that's also good enough to protect your bearings and gears is Amsoil.

[MoonieGT]

Interesting. TrackDog told me to buy Motul because it would smooth up shifting, and it did in my '91. That's why I bought it for my '99...

[MoonieGT]

Now I'm more confused. I just pulled this off a website about Motul Gear 300:

API Standards:	API GL-4/GL-5
OEM Approvals :	MIL-L-2105D

So is it a GL-4 or a GL-5?

[SirHustlerEsq]

Now I'm more confused. I just pulled this off a website about Motul Gear 300:

API Standards:	API GL-4/GL-5
OEM Approvals :	MIL-L-2105D

So is it a GL-4 or a GL-5?

You guys can run whatever you want. I've managed to survive 3-years of tracking my turbo car and ~30k miles on the 6-speed from using GL-4 that sees 300*f on the track. I've had two 5-speeds that were "sticky" on downshifts on a couple gears and they ran M1 or something else. AMSoil MTG also looked great after 15-track days when I sent the oil analysis with no measurable shear. :)

[Nails]

mrbrg: Is the amsoil mtg recommended for the NC 5-speed? Or is it an entirely different tranny from the previous generations? I need to change my fluid soon and have the typical 1-2 notch.

[SirHustlerEsq]

I don't know but I assume it has brass synchros.

[johnwag]

mrbrg: Is the amsoil mtg recommended for the NC 5-speed? Or is it an entirely different tranny from the previous generations? I need to change my fluid soon and have the typical 1-2 notch.

call mazda and ask them what the recommended oil is for the NC and what the API rating is.

[Electro]

Wags - You replenished your oil supply yet?

[johnwag]

Wags - You replenished your oil supply yet?

I've been needing to. I'm getting cases of both MTG and SVG this time. I'll also have some grease and other random stuff I'll be trying out.

[motorollow]

Pennzoil Synchromesh is the bomb!! Motul is not good for my 94 NA transmission. I was thinking it was time to replace the tranny, not anymore!!

[NC Eunos]

NC trams run GL-4 in the trans as well.