Is this an MTL suitable for syncromesh transmissions

[Spitty]

It is rated GL4

 

[Greasymechtech]

Its suitable for transmissions that call for mineral/conventional 80w90 GL4.

I wouldn't want that in my manual transmission. Best to leave it for the trucking fleet.

 

[bullwinkle]

It is rated GL4

That’s the stuff my Toyota manuals are supposed to use, but I run Pennzoil Synchromesh in them, it’s a lot thinner in winter conditions. Around 0F regular 80W-90 gear oil is like stirring a bucket of jello with the shifter!

 

[Jethro_Bob]

Sure, if you want to put a 90w in place of a 30w. Might be ok on the hottest summer days, but even syncromesh can be a pain to shift at 15f.

 

[Spitty]

The viscosity is as recommended for the application. My preference would have been Redline MTL.
But would this Castrol product have friction modifiers ?
Is there another Castrol product that would be preferable ?

 

[slacktide_bitog]

Do you have a pic of the back of the bottle?

It is probably safe to use, though in Canada you have access to synthetic 75w90 that may be more suitable for your conditions

Here is the PDS

Of course, you can always get a VOA done on it. Just don't use Wix/ALS

 

[ceecbtg]

Yes, but it will not be very friendly when cold.

 

[MolaKule]

It is rated GL4

A bit high in viscosity (17 cSt@100C) for a 90 grade transmission oil; most come in around 14 cSt.

Is this the product you're discussing?

https://msdspds.castrol.com/bpglis/...AC1CAB0802583610023FA27/$File/BPXE-B7K6N3.pdf

They make no claims of improved shifting so the proper friction modification chemistry may not be there.

 

[930.engineering]

But would this Castrol product have friction modifiers ?

Most probably.

Is there another Castrol product that would be preferable ?

What car, what transmission?

I used to use Castrol Syntrans V-FE 75W-80 (Transmax Manual V 75W-80 now)
for almost four years. It feels virtually the same as VW G 052 527 & G 052 171.
Why I run VW G 052 527 again? Just because I have some bottles left of them.
If your MT calls for a 75W-80 GL-4 I would highly recommend Syntrans V-FE/
Transmax Manual V 75W-80.
.

 

[Spitty]

Thanks guys, the car is not mine, it belongs to a friend in Southern Europe, so temps get quite high. He favours Castrol products in his British car.

 

[slacktide_bitog]

Thanks guys, the car is not mine, it belongs to a friend in Southern Europe, so temps get quite high. He favours Castrol products in his British car.

In Europe, it is easy to get synthetic Castrol Transmax Manual 75w90. There are two versions: Multivehicle and Transaxle; either should be suitable for your car.

 

[Revving2Redline]

Redline MT90. I feel if your going to really push it this is the way to go.

https://www.pegasusautoracing.com/productselection.asp?Product=MT201
GL4 compatible Motul 300v

 

[Spitty]

What would a recommendation be if an electriclly operated wet clutch Overdrive were coupled and shared lubricant with the transmission ?

 

[slacktide_bitog]

What would a recommendation be if an electriclly operated wet clutch Overdrive were coupled and shared lubricant with the transmission ?

maybe you might like Castrol Transmax Manual 75w90 Transaxle