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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2952
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Thu Jan 10, 2019 4:33 pm    Post subject: 5W30 Reply with quote

I’ve been losing sleep over my hot idle oil pressure. Just about 1 bar. It’s been doing my head in Rolling Eyes even though I’m not getting any low pressure warnings.
And then today, looking up the last service (done by previous owner) I just about made out a scrawl of 5W30 on the mechanics notes. On a 3.4 with 107k miles. wack
The service was done only a few months ago but this oil needs to come out pronto!
I’m juggling between 5W40 or going the whole hog , Millers CFS 10W50.

Thoughts?

Also, any guesses as to the sort of hot idle oil pressure increases I’d expect using the above oils?
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'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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kas750
Reims


Joined: 31 Mar 2013
Posts: 4366
Location: Chorley lancashire

2006 Porsche 911

PostPosted: Thu Jan 10, 2019 4:47 pm    Post subject: Reply with quote

Your oil pressure is fine.
I used 5w/50 and mine sits at a bugs dick over 1 bar,stinking hot after I've just kicked its head in. Thumb
 
  
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Ghianightmare
Spa-Francorchamps


Joined: 25 Apr 2017
Posts: 264
Location: Dublin


PostPosted: Thu Jan 10, 2019 5:42 pm    Post subject: Reply with quote

Ballcock,

I switched to the Millers 10-50nano. Hartech advise using a thicker oil as does the guy Raby in the USA that is one of the PCAs (Porsche club America) go-to guys as he is one of the main 996 and 997 engine rebuilders.

I wouldn’t rely on the pressure gauge. Both the senders and the gauges can be inaccurate.

If you are in the PCI, there is a club sponsor that supply Miller at very good proces
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2952
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Thu Jan 10, 2019 6:02 pm    Post subject: Reply with quote

Thanks Ghia, YHM.
Personally I’d like to see more than a bar hot idle.
Bearings are soft on these!
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'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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alex yates
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 15565
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Jan 10, 2019 6:27 pm    Post subject: Reply with quote

I've hovered between 0.8-1 bar for 5 years now and the car's up at 132k with no engine work.
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2952
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Thu Jan 10, 2019 6:35 pm    Post subject: Reply with quote

That’s interesting Alex thanks, I thought the standard was 1.5 to 2. It was on my last 996.
I’ve seen quite a few posts on here stating 1bar is worryingly low.
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‘98 Ocean blue 996 C2 Tip pressed into daily service.

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thecarfixer
Monza


Joined: 03 Nov 2016
Posts: 164



PostPosted: Thu Jan 10, 2019 6:43 pm    Post subject: Reply with quote

2.0 - 2.5 bar in the main on mine in cold weather conditions.

1.0 bar when I've absolutely spanked it in hot weather

Above 1 bar - generally closer to two in cooler conditions.
 
  
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2952
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Thu Jan 10, 2019 6:55 pm    Post subject: Reply with quote

Thanks, that’s what I remember from my last one. What oil are you using?


Mine goes to one bar pretty much after 20 minutes of normal motorway driving. Mid winter.
I should add that I’ve had the sender replaced, and the gauge seems to be working normally.
4.5 bar when cold idle,
And even when hot it will go to 2.0 bar once the revs go a smidge above 1000.
I’ve cleaned the throttle body, thinking the idle revs a are bit low (about 650 when hot). No change.
I’m very hopeful fresh oil of the correct viscosity will make the difference.
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‘98 Ocean blue 996 C2 Tip pressed into daily service.

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Ex. '99 996 C2 manual coupe.
 
  
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Chris_in_the_UK
Estoril


Joined: 19 Mar 2014
Posts: 3552
Location: Harrogate


PostPosted: Thu Jan 10, 2019 7:02 pm    Post subject: Reply with quote

10w-50 Millers all day long.
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thecarfixer
Monza


Joined: 03 Nov 2016
Posts: 164



PostPosted: Thu Jan 10, 2019 7:04 pm    Post subject: Reply with quote

Millers CFS 10w50 Nano (that's due for a change)
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6178
Location: Brighton


PostPosted: Thu Jan 10, 2019 7:38 pm    Post subject: Reply with quote

1 bar is fine .. if you want a totally accurate measurement then you need to fit an external gauge and check it .

If you have a flickering oil light then its time to worry ... never seen it though in 15 years ... in fact i dont remember a low oil pressure fault on Any Porsche in that time ... well not totally true .. some of the 1970 cars suffer a bit on idle .. never a problem though .

0/30 ?? really ? only time we use that is on diesels !

5/40 is the oil we would use and obviously there are many people that choose different oils but anything from 0/40 and up is fine .

0/40 and thats what an OPC would use fyi .
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2952
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Thu Jan 10, 2019 8:20 pm    Post subject: Reply with quote

As always thanks DM for your professional input.
Yeah, re the 5W30, I’ve no idea what that lad was smokin.

@Chris and TCF, thanks guys,
Millers CFS 10W50 has been ordered. Oil change late next week when I’m back in town.
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‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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Marky911
Watkins Glen


Joined: 04 Jun 2009
Posts: 2182



PostPosted: Fri Jan 11, 2019 8:22 am    Post subject: Reply with quote

Another sufferer of pressure gauge paranoia here. Grin
My car used to sit at 1bar hot idle. 1.2 bar after moving to Millers 10/50.
Even then it would be 1 bar after say leaving the car running throughout an mot, and revving it to get the emissions to drop into spec.

I had my Indy use his mechanical gauge at my last service. My dash gauge is upto 0.3 bar out at various different temps and revs.

I had my oil analysis done and all good so I just need to get over it. Very Happy

I'm usually running 10/50 Millers, although currently I'm on my Indys Porsche spec stuff (so a 40 grade) after my top end work. I'll be switching back to Millers by the summer.

I think 2 bar+ is very high at hot idle. If mine were that high I'd be wanting it checked for accuracy too.
Turn your ignition on but don't start the engine. If the needle goes to anything over "0" the sender's probably faulty.

Edited to add. My car had a bit of a rough idle when really hot, causing the revs to hunt and drop etc. We've just fixed that so that has also helped my pressure. I'm now never below 1.2 bar even on the 40 grade. 1.4 usually, again at idle after a good spanking.

Last edited by Marky911 on Fri Jan 11, 2019 10:37 pm; edited 1 time in total
 
  
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2952
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Fri Jan 11, 2019 12:58 pm    Post subject: Reply with quote

Thanks Marky, can you give some more detail on the work done to cure the hot idle roughness?

Also, and I should have mentioned earlier, when I switch my air con on I do NOT get the few hundred rpm increase that some mention here, so I can’t use this to increase idle and therefore the oil pressure.
Interestingly the aircon does work, difficult to assess during cooler months but it clears condensation very quickly once on ....
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'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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Robertb
Long Beach


Joined: 01 Sep 2003
Posts: 6844
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Fri Jan 11, 2019 1:58 pm    Post subject: Reply with quote

I had some Millers 10w50 put in my car for its last service.

I was skeptical, but I'm surprised by the difference its made to the car. Quieter on start up, particularly after a week or so of not being used.
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wasz
Sepang


Joined: 28 Dec 2012
Posts: 2869


1999 Porsche 996 Carrera 2

PostPosted: Fri Jan 11, 2019 2:29 pm    Post subject: Reply with quote

ballcock wrote:
Thanks Marky, can you give some more detail on the work done to cure the hot idle roughness?

Also, and I should have mentioned earlier, when I switch my air con on I do NOT get the few hundred rpm increase that some mention here, so I can’t use this to increase idle and therefore the oil pressure.
Interestingly the aircon does work, difficult to assess during cooler months but it clears condensation very quickly once on ....


Something is not quite right.

Clean out and check the operation of your idle valve (if a tip is cable throttle?) and throttle body, check for vacuum leaks, and check the MAF.
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2952
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Fri Jan 11, 2019 3:21 pm    Post subject: Reply with quote

Thanks wasz, will get that done.
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'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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Marky911
Watkins Glen


Joined: 04 Jun 2009
Posts: 2182



PostPosted: Fri Jan 11, 2019 4:11 pm    Post subject: Reply with quote

Hi Ballcock,

My fault was probably a very rare one. A previous owner, or whoever fitted my K&N with induction pipe, refitted the MAF sensor 180 degrees round so it was facing the wrong way. Grin

I had done most of what Wasz mentions before that though as weirdly the MAF never threw up a fault code until this years service.

Anyway mine ticks over really nicely now. Having said that they are never like a 6 cylinder BMW. Again, another bonus of the 3.6s with the later and better Motronic, is that they tick over that bit nicer, as well as sounding that bit better too (due to Variocam+).
 
  
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ballcock
Sepang


Joined: 21 Jul 2008
Posts: 2952
Location: Dublin

1996 Porsche 993 Carrera 2

PostPosted: Fri Jan 11, 2019 6:12 pm    Post subject: Reply with quote

thumbsup

Thanks for that Marky.
180 degrees off
You have to wonder sometimes! Rolling Eyes
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'96 Iris C2 vario manual coupe, Koni FZD's/M033's RSR's and HID's.
‘98 Ocean blue 996 C2 Tip pressed into daily service.

Ex '83 W460 LWB G Wagen updated with OM602 engine and 6 speed 'box
Ex. '99 996 C2 manual coupe.
 
  
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NLW73
Barcelona


Joined: 27 May 2014
Posts: 1395
Location: Yateley


PostPosted: Fri Jan 11, 2019 6:32 pm    Post subject: Reply with quote

as long as the oil is changed regularly then anything from 5w 40 to 10w 50 fully synth should see you right.

some folks do every 6 months if used hard but 12 months is good.

I am not comfortable with the every 2 years in the 997. due an oil drop soon and going to use 5w40 fully synth as had 10 litres left from the 996.
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