Castrol 10W-60 TWS

[XfireZ51]

I have had the EDGE Castrol 10W-60 in my ZF for the last 2 years. I bought it directly from Patrick BMW here in Schaumburg. My ZF has a Hurst short shift on it, and I haven't given the trans a second thought. This is a trans running on a Fidanza FW. Neutral trans noise is minimal. Your experience may vary, but I don't have a reason to switch.

[Jitse]

I am using Castrol Edge 10W60 too, no problem at all here in Holland to get it. price about 20€ a liter. I am happy with this oil , tried other brands but prefer this Castrol Edge, less noise and smooth shifting.

[RussMcB]

This link is to a post from a guy who had Blackstone tests done on each.

http://www.m3post.com/forums/showthread.php?t=926080

My quick read seemed to indicate the newer version is better.

[mike100]

Originally Posted by RussMcB

This link is to a post from a guy who had Blackstone tests done on each.

http://www.m3post.com/forums/showthread.php?t=926080

My quick read seemed to indicate the newer version is better.

Maybe for an engine application, but is the reformulated version still the best choice for synchro friction?

[Dynomite]

Originally Posted by XfireZ51

I have had the EDGE Castrol 10W-60 in my ZF for the last 2 years. I bought it directly from Patrick BMW here in Schaumburg.

Which Castrol Edge are you using?
The label was Castrol TWS Motorsport until Castrol changed the names
Now my question is........Are the Labels Castrol Edge Professional and Castrol Edge TWS the same (Both are 10W-60)?

Castrol TWS Motorsport and Castrol Edge Professional are for all practical purposes the same (not quite identical......but the same).

See A Comparison of Castrol TWS 10W-60 Motorsport and Castrol TWS 10W-60 Edge for comparison of Castrol Motorsport and Castrol Edge Professional 10W-60.



And....then there is 150SM Tranzilla Lube (Rockland Standard Gear)

[XfireZ51]

Motorsports

[Roadster]

I purchased Castrol Edge Professional months ago online, and two replacement plugs (just in case) from my local VW dealer. Still haven't changed anything out yet. I also have no reason to believe that there is nothing but the stock clutch setup in my Z. That being said, it shifts fine, can be a little notchy when cold, but otherwise good when warm.
Probably will change soon, and may as well use the Castrol this time around and maybe switch in another 10,000 miles or so.
Interesting thread, always good info.....

[Hib Halverson]

Originally Posted by Paul Workman

Not having any issues other than not being able to find TWS anymore, AND having a little "curnch" when shifting into 5th ONLY WHEN it is cold, on Marc's recommendation I switched to Red Line Heavy "shock Proof" full synthetic 75W-90.

One outing does not an evaluation make, so I'll save that for later. But, once up to operating temps, it shifts like butter - and no crunch going into 5th; very "normal" feel to it. Check w/ me in November!!

Paul has his signals a bit crossed.

Red Line does not make a product called "Heavy Shockproof full synthetic 75W90."

It makes a product called "Heavy Shockproof" but that's not suggested to be used as a transmission lubricant. Red Line also makes "MT90" a 75W90 GL4 gear lubricant intended for old-fashioned manuals such as Muncies and Warner T10s and it makes a 75W90 GL5 for rear axles.

Regardless of what Marc may say, neither of the above products is suitable for use in a ZF S6-40.

The Red Line products which are suitable for a ZF are:

MTL, which is a GL4, 75W80 and is the most commonly recommended Red Line synthetic product for ZF S6-40s.

Light Shockproof, which is suggested for use in ZFs subjected to severe duty.

The best all round product for street driving is MTL which has good shift feel even at low temperatures. The best choice for a ZF in a car which is tracked or is driven hard on the street in warm weather is Light Shockproof which has outstanding shift feel except when the trans lube is very cold.

Before Castrol changed the marketing of the 10W60, it was popular, I guess, because it was approved by BMW. I've been skeptical because of a conversation I had a number of years ago with Bill Boudreau who told me that, according to his testing, the oil didn't last very long and needed to be changed every 10,000 miles.

I stuck with Red Line Light Shockproof because 1) the shift feel and 2) that I can go 36,000 miles between changes.

[mike100]

^^^ I do believe most synchronizers need a GL-4 lube. Also the gear oil weight rating is not the same as the motor oil weight rating. I also used to run Redline MTL in a T5 5-speed manual in my old Z-28 and that had no ill effects over the 140k miles that I kept track of that vehicle. That would probably be my second choice to Amsoil or GM synchromesh. I can get GM synchromesh at the store down the street for $10 a bottle so there's that...

A 40 weight motor oil grade is like an 85-90 weight gear oil rating- I wouldn't want to go thicker in the ZF as the factory fill was a 30 weight anyhow.
viscosity chart:
-----------------

[tf95ZR1]

Thanks, Mike! I didn't know that about engine vrs. gear oil.

And don't I remember Bill B. saying something about Red Line...?

This is great timing for me, also, as it's time to change the trans
fluid. I've always used Castrol TWS Motorsport 10W-60 from my
local BMW dealer.

I'm gonna be in for a bit more work: with my lowered car,
my drain plug is ground flat. I'll need to cut a pattern in the plug
and avoid the fluid that's going to drain (top/inside of plug is designed
hollowed out) and replace with a new plug. Any other style plug to use?
The stock one sure has thin walls. I hope I used anti-seize on it.