Castrol 10W-60 TWS - Page 5 - ZR-1 Net Registry Forums

Great White · 03-11-2021

Quote:

Originally Posted by Matt B

I just went though this threat as in our German forum we currently have a case of transmission failure and at the same time I'm tidying up my new Z.

My car, as mentioned before, is a 18.5kmls example and I strongly assume (but don't know for sure) that transmission fluid is still factory filled. There are two particular concerns in my case:
- avoid that the new oil removes old debris too aggressively leading to bulky particles that may clog oil passages
- make sure the thing will survive German Autobahn speed.

Castrol Edge 10W60 is fairly easy to get here, but as Marc Haibeck recommends Amsoil 5W30 I wonder which will work better or safer. Marc's recommendation seems much thinner and therefore sounds like improved lubrication at all temperatures.
I don't think either is wrong but is there any better or worse?

Not sure which is better or worse, but the thicker oils tend to quiet things in the gearbox a bit better at higher temperatures. My car has an aluminum aftermarket flywheel so things tend to get a bit noisy after they warm up on my particular blue tag. When I first bought the car, I filled it with Lucas Synthetic Stabilizer because I found nothing else available at the time. I have since switched to the Amsoil Synchromesh 5w30 and haven't had any issues. Both fluids have worked well but I was unsure of how suitable the Lucas would be in this particular application. (It survived a few rounds on the NCM MSP course with no failures with the Lucas stuff in there though.)

Matt B · 03-12-2021

Thanks, sounds good. And just to be sure: it's Manual Synchromesh Transmission Fluid we're speaking about? I couldn't find some other with no "synchromesh" in its name.

Great White · 03-13-2021

Quote:

Originally Posted by Matt B

Thanks, sounds good. And just to be sure: it's Manual Synchromesh Transmission Fluid we're speaking about? I couldn't find some other with no "synchromesh" in its name.

Yes that is correct. I spoke with my local Amsoil distributor before I used it and he confirmed that this fluid meets the specifications set fourth by ZF for our S6-40 transmissions. Below is a link to the product.

https://www.amsoil.com/p/manual-sync...uid-5w-30-mtf/

Sent from my BBF100-2 using ZR-1 Net Registry mobile app

-=Jeff=- · 03-13-2021

I prefer the Amsoil to the TWS, transmission is very smooth with Amsoil, not so much with the TWS

03-12-2021	#42
Matt B Join Date: Jan 2021 Location: Beautiful Bavaria Posts: 520	Re: Castrol 10W-60 TWS Thanks, sounds good. And just to be sure: it's Manual Synchromesh Transmission Fluid we're speaking about? I couldn't find some other with no "synchromesh" in its name. __________________ ZR-1 #638/1991

03-13-2021	#44
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,137	Re: Castrol 10W-60 TWS I prefer the Amsoil to the TWS, transmission is very smooth with Amsoil, not so much with the TWS __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978