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cryddaboy66
Newbie


Joined: 04 Sep 2013
Posts: 6
Location: Madrid


PostPosted: Fri Sep 01, 2017 5:21 pm    Post subject: 993 C2 manual gearbox oil type Reply with quote

Having done a search I can't seem to find the answer to my query further below.

The owner's manual states the following for a manual box:

"SAE 75 W 90 gear oil, API classification GL 5 (or Mil-L 2105 B)."

This is what my specialist tells me is in the car, but I am experiencing a slight 'crunch' on gearshifts, which is both worrying and less than satisfying. It would also seem to have nothing whatsoever to do with wear on synchros, as the car only has 26k miles on it (!). The problem is present both cold and hot. Sometimes I manage to get a perfect shift, but more often than not... not.

I've read on a US forum that many 993 owners there swear by Red Line 75W90 NS (apparently the NS stands for 'Non-Slip') and that it is the ideally suited to the 993 manual box and will resolve my problem. I'm thinking of buying some to try it out.

Can anyone make any recommendations? Anyone tried the Red Line oil?
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Endoman
Imola


Joined: 11 Apr 2011
Posts: 839
Location: Bolton U.K.


PostPosted: Fri Sep 01, 2017 5:51 pm    Post subject: Reply with quote

Try bleeding the clutch hydraulics as well mine is super smooth on Mobil after 160k miles (it has been changed btw.)
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Chris993C2
Hockenheim


Joined: 09 Mar 2010
Posts: 626
Location: South Bucks


PostPosted: Fri Sep 01, 2017 6:10 pm    Post subject: Reply with quote

Welcome
And another Speed Yellow 993? We need more pics... Cloud 9
 
  
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cryddaboy66
Newbie


Joined: 04 Sep 2013
Posts: 6
Location: Madrid


PostPosted: Fri Sep 01, 2017 6:30 pm    Post subject: Reply with quote

Chris993C2 wrote:
Welcome
And another Speed Yellow 993? We need more pics... Cloud 9


Glad to 'meet' another Speed Yellow! Impeccable taste....

I'm actually a Brit located in Spain, here are some pics of me and the car en route to new home in Madrid (that's if I can work out how to put pics into a post...).
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cryddaboy66
Newbie


Joined: 04 Sep 2013
Posts: 6
Location: Madrid


PostPosted: Fri Sep 01, 2017 6:32 pm    Post subject: Reply with quote

... but back to the point in question: I am told that precise oil type is key to getting the best from a manual box. Any particular brands or oil that have given A1 results?
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Gaity
Silverstone


Joined: 25 Sep 2008
Posts: 113
Location: Mid-Wales and Sunderland


PostPosted: Fri Sep 01, 2017 6:57 pm    Post subject: Reply with quote

+1 for checking your clutch is operating properly. Not sure if it is the same stuff but I use Redline Heavy Shockproof oil in my gearbox (C4S) - rated as a 75W90 but its chemistry reduces thinning at gear tooth contact points where it can be classed as a 75W250, apparently. No issues at all.
 
  
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Barryn
Monza


Joined: 19 Oct 2013
Posts: 169
Location: Cumbria and West London


PostPosted: Sat Sep 02, 2017 12:40 am    Post subject: Reply with quote

Lovely car, you are very lucky.

Clutch fluid change is a great start, just like the brakes they need fresh dry fluid every few years. If the problem persists I would be looking at your rear engine mounts they have a sell by date.. start to sag then that ruins the shifting, especially from first to second.
As you quite rightly say the gears and gear box should be fine, it's the perishable/soft bits I would be looking at initially.



Question
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decgraham
Suzuka


Joined: 17 Sep 2008
Posts: 1101
Location: Spain


PostPosted: Sat Sep 02, 2017 7:07 am    Post subject: Reply with quote

Off topic but another Brit in Spain with a 993 Thumb if you find yourself down on the coast near Denia drop me a PM and we can meet up.

ATB Smile
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MilSub
Spa-Francorchamps


Joined: 10 Jun 2014
Posts: 301
Location: Hampshire


PostPosted: Sat Sep 02, 2017 5:17 pm    Post subject: Reply with quote

Love the speed yellow! welcome to the forum

I had my gearbox oil replaced a few months ago, the specialist used Mobilube 1 SHC 75W-90 - I didn't have any problems with gear changes prior to that, but as I had no idea how long the oil had been in there thought it would be a good idea to replace.

They said the oil that came out was pretty gross in both colour and aroma - I'm sure the gearbox feels smoother since the oil change, but I could be imagining that ..
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cryddaboy66
Newbie


Joined: 04 Sep 2013
Posts: 6
Location: Madrid


PostPosted: Sun Sep 03, 2017 6:09 pm    Post subject: Reply with quote

MilSub wrote:
Love the speed yellow! welcome to the forum

I had my gearbox oil replaced a few months ago, the specialist used Mobilube 1 SHC 75W-90 - I didn't have any problems with gear changes prior to that, but as I had no idea how long the oil had been in there thought it would be a good idea to replace.

They said the oil that came out was pretty gross in both colour and aroma - I'm sure the gearbox feels smoother since the oil change, but I could be imagining that ..


Many thanks for the welcome and the info. I am going to change the oil to the Red Line 75W90NS stuff which seems to be popular in the USA and has solved at least one guy's problem (gear crunch) which is the same as me. As the SAE rating is that recommended in the Owner's Manual, I reckon I can't go far wrong.
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Cameltoe & Heel
Suzuka


Joined: 26 Jan 2009
Posts: 1017
Location: Preston - Lancs


PostPosted: Mon Sep 04, 2017 7:16 am    Post subject: Reply with quote

Lovely car, please report back with your findings.

Has your gearbox oil been changed in the past?, could be original stuff?.

Trev
 
  
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cryddaboy66
Newbie


Joined: 04 Sep 2013
Posts: 6
Location: Madrid


PostPosted: Mon Sep 04, 2017 8:05 am    Post subject: Reply with quote

Cameltoe & Heel wrote:
Lovely car, please report back with your findings.

Has your gearbox oil been changed in the past?, could be original stuff?.

Trev


Thanks. Oil has been changed recently (which might be the problem...). I am unsure exactly what type was used - hence getting it changed for the Red Line stuff which is recommended by our American friends. Once the Red Line 75W90NS is in the box I will report back with findings...
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wilsonny
Silverstone


Joined: 01 Dec 2012
Posts: 109
Location: Montreal


PostPosted: Tue Sep 05, 2017 9:32 pm    Post subject: Reply with quote

I changed my oil last year and just asked my local OPC for the recommendation. Took a while, but they came back with 99991754600 and the attached tech note for this recommendation. I also did the rear engine mounts at same time. Maybe the oil is just Mobil rebranded of course Smile

My car did have a bit of stiffness going into 2nd when cold when I got it, but this has gone away. Don't really know if that is down to this maintenance/oil change or just me using the car more than the previous owner.
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mightyvr6
Trainee


Joined: 10 Jul 2016
Posts: 70
Location: Staffs


PostPosted: Tue Sep 05, 2017 10:08 pm    Post subject: Reply with quote

I used the shell transaxle oil as listed in the table above with a good improvement. Got some left if anyone's interested?
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cableguy
Barcelona


Joined: 10 Sep 2007
Posts: 1295
Location: North Yorkshire


PostPosted: Tue Sep 05, 2017 10:15 pm    Post subject: Reply with quote

mightyvr6 wrote:
I used the shell transaxle oil as listed in the table above with a good improvement. Got some left if anyone's interested?


Yes please. My cars going in next month for a few bits including gearbox oil change. Could you please PM me details on how much you have, cost etc.

C.
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Cameltoe & Heel
Suzuka


Joined: 26 Jan 2009
Posts: 1017
Location: Preston - Lancs


PostPosted: Tue Sep 19, 2017 7:48 am    Post subject: Reply with quote

Found this on RL from a chap complaining about difficulty shifting from 2-3 after trans oil change......may be of interest


I had this problem with my 1997 993 after a transmission oil change. I discovered that Porsche had issued a Service Bulletin stating that only a specific transmission oil type was now approved -- my mechanic had not read the Bulletin and was using some other unapproved product. We drained the new fluid and replaced it with Porsche approved transmission fluid and the problem was solved.

Pelican Parts sells the correct Porsche transmission fluid--this is where I purchased mine. Details below:

Manual Transmission Fluid - SAE 75W-90, (20 Liter)
Part #: 000-043-305-48-OEM
Part #: 000-043-204-19-OEM (Superseded)

Attached here too is the Porsche Service Bulletin.
 
  
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ChrisT70
Barcelona


Joined: 26 Mar 2015
Posts: 1432
Location: The Sea


PostPosted: Tue Sep 19, 2017 9:33 am    Post subject: Reply with quote

dont buy 20l though! you only need 4 litres or so. (and a proper pump as i discovered!) Thumb
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cryddaboy66
Newbie


Joined: 04 Sep 2013
Posts: 6
Location: Madrid


PostPosted: Fri Sep 22, 2017 12:31 pm    Post subject: Reply with quote

OK, so I changed the gearbox oil this week: a local specialist put in 3.6 litres of Red Line 75W90 NS. The stuff that came out looked in excellent condition (consistent with a recent change by the specialist I bought the car from).

There has been absolutely no improvement in the gear change, so it's obviously not the gearbox oil type or quantity.

Reading around, I'm beginning to suspect that the clutch may need bleeding. It can't be the slave or master cylinder as they were replaced by the specialist before delivery. I understand that there is no adjustment possible on the 993 hydraulic clutch, and that air bubbles may cause problems.

Back to the specialist... (well they did say this would be a hobby, not a car).

frustrated
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RobIpswichUK
Kyalami


Joined: 27 Aug 2010
Posts: 1887
Location: Ipswich (at a guess!)

1994 Porsche 993 Carrera 2

PostPosted: Sat Sep 23, 2017 7:52 am    Post subject: Reply with quote

I'd still replace the rear engine mounts with either the C4 mounts (slightly less compliant than the expensive C2 mounts) which has helped on a lot of people's cars or go for the RS or Wevo mounts. Plenty of good results with 1st to 2nd improvement and a cheap DIY job
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'94 C2 Iris Blue (+ White Stripes!)
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