CASTROL oil for tranny/diff
 

Hello,

I would like to know if some people would have used castrol oil or have opinions with this brand.

I know many people recommend redline MT85 but I have also seen posts mentioning somes problems with this oil.

At the moment, it is difficult to buy redline oil in France, that is why I am going to Castrol for my Z.

The website of Castrol recommend :

CASTROL SYNTRANS MULTIVEHICLE 75W90 (GL4) => for tranny
CASTROL SYNTRAX LONG LIFE 75W-90 (GL5) => for diff

Has anyone ever used these oils ? should I wait for redlines oils ?


Thank for your response :)

For a DD, any high-quality lube will work and Redline will be overkill (a good kind of overkill; mainly a waste of money). Full synthetics tend to do better than petroleum-based or blends, but, for a DD, a syn-blend will do the job well. Pick any high-quality brand, change it often, and you should get many miles out of your drive train.

Many people on this site swear by Redline lubes and I don't remember seeing any problems being reported. I've never had need to use Redline but, if I ever have the need, that is the first brand I will try.

Have you considered using Motul Gear 300 75W-90? It's a premium, fully synthetic (... albeit pricey) gear oil made by a French company. You should be able to purchase it locally... perhaps at a reasonable cost.

I have seen Motul but only for diff oil : Motul Gear 300 LS 75W90 (20 euros per liter)
For diff is ok but there is no motul oil for tranny with GL4 strict specification.

For Castrol oil, we have CASTROL SYNTRANS MULTIVEHICLE 75W90 (GL4) but is the viscosity is 75W90, is it ok ? FSM advise to use 75w85.

The Motul Gear 300 75W-90 meets both the API GL4 and GL5 standards. I've been running the Gear 300 in the transmission and the Gear 300 LS in the differential without issue for a number of years. It's probably overkill for a DD, but it provides ease of mind. The 75W-90 viscosity is fine IMHO.

what does 'DD' mean ? please.
I don't understand English well :icon17:


There is a debate on the French forums for the use of the motul gear 300 for tranny. People strongly advise against Motul gear 300 it because of the GL4 / GL5 mention.
I trust this forum the370 more than french forum, we have very few nissan 370z. People living on the North American have more experience on japan cars.

But I don't use motul for tranny because it will be difficult to sell later if I use this oil :rofl2:

If 75W90 viscosity is Ok, I will try Castol oil for trann (unless the redline MT85 will be back)

How about Nissan dealership? Just get Nissan fluids.

DD stands for Daily Driver

There is also Liqui-Moli: https://www.liqui-moly.com/en/servic...766dec7b7b72c/

Many people complain about Nissan oil (difficult shifting).

That's why I'm going to Castrol/motul oil/ (Redline if t's possible, I should wait a few months for that)

Also, Not sure how Motul gets an oil to perform GL4/GL5 work, but nottheless, our MT transmissions require GL4.

GL5 contains Limited slip Friction additives that eat "Yellow" metals like Brass, Bronze etc. I believe the Synchros in our MT have yellow metal.

For that reason, I'd also steer away from the GL5 ratings.

Regular Gear oil will be either 80W90 but if you go with a Synthetic, it will become USUALLY 75W90. Same would apply to other weights. So you are ok with those grades.

I'm using it in my MT 2017 Nismo right now. Never had an issue. I think it comes down to driver, sometimes. :)

This piqued my interest. So I checked the technical specs for Motul Gear 300 and, according to Motul, it is suitable for all types of seals and yellow materials used in gearboxes. Presumably, the sulphur additive they use is buffered to prevent/reduce any brass/copper components in the tranny from sloughing off.

You will be fine with the Castrol lubes you picked. I've used Castrol products for years. Love their oil in my bikes.

The Motul 300LS 75w90 is proper fluid for both the transmission and differential in the 370Z :twocents:

Yeah, so be it. I'm guessing Motul engineers have devised a new additive to help with LS and not be "corrosive" against certain metals.

I read old posts that the MT85 allows to shift easily.

Is it the best for shifting gears easily ? or all synthetic oils (including castrol) do the same thing?