Pags993

^^^ almost positive you are correct Mike the Porsche OEM fluid in the grey non retail looking bottle is simply an OEM rebrand of the Shell Spirax S4 - 75W90 produced and sold globally.

The dealer is easily making 70 to 80 points on the sale of the litter bottles if not more.

Pags993

Oops 1 litter bottles

Pags993

Stupid auto correct LOL

pp000830

There seems to be lots of antidotal experience of differing shifter feel with different brands and types of transmission lubricant. As the first and second gear synchros start to loose their effectiveness due to wear I suspect small changes in the properties of the lubricant have profound impact on the feel and smoothness of shifting.


In my case I was unaware that my car transmission was near the end of synchro life. The symptom was incremental progressive dinging of gears while shifting from first to second gear when the car was cold. I thought it was simply because of the recent cold weather.


I changed out the old tired lubricant for new and found this made shifting a big problem resulting in having the synchros replaced. Upon inspection of the synchro assemblies the friction surfaces were nearly smooth and probably the only reason they synchronized the gears at all was because the old lubricant was shot and did not impede their grip to the facing rings very much.


Just one data point and food for thought.
Andy.

Kiwi Carguy

I've changed to Redline MTL ns and have noticed a vast improvement in shifting.

Before that due to baulky shifting and slight graunching from 1st to 2nd and from 3rd down to 2nd I had my Indy change the gearbox oil. They put in the the standard stuff they do in all their P-Cars but I saw no improvement.

I purchased the Redline myself and got them to replace it and and now the shift is slicker and no graunch when moving through the gears at pace.

I read all the threads on here and there are varied views on this topic but many have had a good experience with the Redline. I had thought I'd stuffed my LSD due to some shuddering when reversing. My mechanics inspected the car and said it was a combination of the LSD working much better with the new oil and my new tyres that were much grippier!

I also changed the shift rod bushes which further improved the engagement etc.

Mike J

Did you change the shift rod bushings after the oil change, or at the same time?

This experience illustrates the variability of the transmissions and oils - many difference experiences out there, its almost personalized to each individual car...

Next trans oil change I will be trying the Redine likely since I have a gallon on the shelf, and it's staring at me...

Cheers

Mike

Kiwi Carguy

I thought someone might ask that No I didn't. I only actually had them done this week. The oil was done over a year ago and the Golden Rod etc before then. There was certainly an improvement changing to Redline.

The improvements were in different areas of the shift though. The oil "smoothed out" the shift and the gears engaged better. Whereas the bushes took out the final bit of slop that made it a little difficult at times to find the gear (particularly 2nd).

The other bits I replaced was the teflon bush in the shifter itself but that was a while ago too. My comments on the Redline is really comparing it back to back with new oil put in previously and no other changes/mods.

I think if people are happy with the shift using Mobil Delvac or other oil then continue using it however if they continue to have issues then the Redline is worth trying. My Indy said most of the race guys here use it on the P-Cars. They just don't use it in their customers cars as its much more expensive than the oil they are using.

P-daddy

I recently switched to Redline NS. It now shifts much better and no mo crunch going 1st to 2nd.

hkspwrsche

Looking at motul myself. Looks like a good option; although expensive.

Mish_Mish

I just bought '96 C2 with LSD and drained original gear oil at 64K miles, naturally looking like metallic paint, due to all synchronizer residue Third and second gears were little notchy when cold, but I was told that these gearboxes are never silky smooth.

I just changed gear oil in my 993 C2 to Redline MTL and also see smoother shifting across all temperature ranges, even my notchy 3rd is much smoother now. If I shift very fast into third, it goes right in like butter, same if I shift slow, but if I shift quick, it might give me a little unpleasant feedback, not grind, but a notch. I will replace that synchronizer when I do engine out, so it does not bother me a lot...

My concern is that MTL not designed for hypoid gears and LSD differentials and not GL5, so your long-term experience is much appreciated.

My 996 Turbo is running on MTL for 6K miles now and I have no problems to report.

Thank you!

JasonAndreas

You want Shell Spirax S5 ATE 75w90 and not the S4 product that is only GL-4 rated.

enjoytheride

Redline "MTL NS" isn't a Redline product. There are:

Redline Gear Oils

I'm curious to know what Kiwi Carguy really used because I changed out my probably-factory-fill-oil for Redline 75w90 NS and got increased notchiness, particularly in the cold.

How can we be sure it's ok to run GL-4 in the G50?

GTgears

GL4 isn't right for your gearbox. Thats for a transmission not a transaxle. The shifting will be great and the ring and pinion will eat itself.

evilfij

I bought some redline 75w90 NS

I am not sure what is in it now to compare, but should have a report soon. The various redline products have been great MT90 in my lotuses and Tacoma, MTL in my rovers so looking forward to trying in the 993, but it already shifts great so ....

Mish_Mish

My concern exactly, so I am thinking perhaps some additive from Lucas, to please hypoidal gears?