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NLW73
Österreich


Joined: 27 May 2014
Posts: 988
Location: Yateley


PostPosted: Tue Feb 13, 2018 9:26 pm    Post subject: 5W50 or 10W50 oil ?? Reply with quote

have recently changed the oil on the blue baron to mobil 1 0W40 after 1500 miles on 0W40 semi synth after a rebuild.

it seems to be a little smokey on start up after its been sat for a while so maybe the oil is getting through the heads as its common on the flat 6 I am told.

i think the engine needs some more running in as its only been 1500 miles

am thinking its too thin and have been advised to look at a 5W50 or 10W50 fully synth oil like the Millers.

is anyone else running this oil and find it better than 0w40?

is it the case that 0w40 is a lot thinner when its cold hence the 0 setting and its not as effective when hot as a 50?

thanks
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skinny_monkey
Spa-Francorchamps


Joined: 16 Sep 2014
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PostPosted: Tue Feb 13, 2018 10:13 pm    Post subject: Reply with quote

A 0W is thinner when cold than a 10W.

Its still a shed load thicker when cold than any other engine oil is when warm tho.
 
  
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alex yates
Donnington
Donnington


Joined: 06 Mar 2014
Posts: 12050
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Feb 13, 2018 10:18 pm    Post subject: Reply with quote

skinny_monkey wrote:


Its still a shed load thicker when cold than any other engine oil is when warm tho.


As seen on your pressure gauge.
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asterix_the_gaul
Imola


Joined: 20 Dec 2008
Posts: 825
Location: Cheshire


PostPosted: Tue Feb 13, 2018 10:20 pm    Post subject: Reply with quote

Unless you are intending for it to see some track action there is not much point putting xW50 oil in.
5w40 FS should be fine, I know hartech put 10w40 in their rebuild engines, but this has always seemed odd to me. I would have thought the 5w40 should resolve the smoking,
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wasz
Watkins Glen


Joined: 28 Dec 2012
Posts: 2101


1999 Porsche 996 Carrera 2

PostPosted: Tue Feb 13, 2018 10:41 pm    Post subject: Reply with quote

I wouldn't put a 0w oil anywhere near a car with a few miles on.

The only purpose such a thin oil serves to to reduce startup emissions.

I run a Millers 10w40 on my 130k+ 996 as many engine specialists suggest. I have very short drain periods (6k miles max).

Asking for oil advice on the internet is opening a can of worms.
 
  
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Marky911
Suzuka


Joined: 04 Jun 2009
Posts: 1209



PostPosted: Tue Feb 13, 2018 11:13 pm    Post subject: Reply with quote

I've just switched to 10/50 millers. Summer car, occasional use so high temp viscosity is more important to me than cold start.

Gauge now reads 0.5 bar higher when idling, hot.

As said, it's all a can of worms, but I'm happy with the higher temp protection.
 
  
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Martin996RSR
Silverstone


Joined: 08 Dec 2016
Posts: 127



PostPosted: Wed Feb 14, 2018 8:51 am    Post subject: Reply with quote

I used to get a puff of smoke on startup from mine, I tried 10W40 and it didn't help, and then I had a catastrophic AOS failure. Once the AOS had been replaced with a new one, the smoke on startup thing went away.

Did you replace yours as part of your rebuild?
 
  
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maldren
Montreal


Joined: 07 Oct 2016
Posts: 545



PostPosted: Wed Feb 14, 2018 10:20 am    Post subject: Reply with quote

wasz wrote:
I wouldn't put a 0w oil anywhere near a car with a few miles on.

The only purpose such a thin oil serves to to reduce startup emissions.


I thought his too although I don't know how it works, I would have thought the thinner oil would produce more oil burning on startup (smoke etc)?
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alex yates
Donnington
Donnington


Joined: 06 Mar 2014
Posts: 12050
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Feb 14, 2018 10:54 am    Post subject: Reply with quote

Use mine daily all year for 4 years now + summer eurotrips. 123K miles on mobil 1
0w50 from day 1. Uses about 1 litre per 10k miles. Long way before I catch poppopbangbang at quarter of a million miles on mobil 1.

Not saying its right..........but if it ain't broke...... Dont know

My mate's logic is thinner when cold circulates everywhere quicker on start up and prevent less initial wear. Who knows? Dont know
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NLW73
Österreich


Joined: 27 May 2014
Posts: 988
Location: Yateley


PostPosted: Wed Feb 14, 2018 11:27 am    Post subject: Reply with quote

Martin996RSR wrote:
I used to get a puff of smoke on startup from mine, I tried 10W40 and it didn't help, and then I had a catastrophic AOS failure. Once the AOS had been replaced with a new one, the smoke on startup thing went away.

Did you replace yours as part of your rebuild?


I am not sure to be honest martin so will check

AOS - is that the air oil separator?
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C4-STORM
Nürburgring


Joined: 29 Aug 2017
Posts: 394
Location: Hampshire

2004 Porsche 996 Carrera 4S

PostPosted: Wed Feb 14, 2018 11:30 am    Post subject: Reply with quote

.. makes sense.

I have continued using Mobil Super 3000 5w/40 which 'seems' fine. Was a little concerned about consumption early on in ownership - but I think that's just me being paranoid as not really had any issues since.

Full pressure on the gauge and engine sounds again fine from cold start

Plan to change twice yearly for the sake of it. 88k on mine, not my daily Thumb
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alex yates
Donnington
Donnington


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Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Feb 14, 2018 11:30 am    Post subject: Reply with quote

Yes.....and if its worn will allow oil to get into the air intake. So then may show as a smoky start-up.
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wasz
Watkins Glen


Joined: 28 Dec 2012
Posts: 2101


1999 Porsche 996 Carrera 2

PostPosted: Wed Feb 14, 2018 12:35 pm    Post subject: Reply with quote

alex yates wrote:
My mate's logic is thinner when cold circulates everywhere quicker on start up and prevent less initial wear. Who knows? Dont know


The thinner oil is great when engines are new - as you say it gets everywhere quick, and reduces friction. The manufacturer loves it because less friction = more efficiency = lower emissions.

But on a worn engine with wider tolerances does it provide a useful film to prevent wear?

I wonder if you used 5w40 oil would your car consume less oil? However as you say perhaps if it ain't broke, don't fix it, and that consumption is within handbook tolerance.

I'm not an oil or even an engine expert and most forum users aren't either, thats why theres so many arguments.
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alex yates
Donnington
Donnington


Joined: 06 Mar 2014
Posts: 12050
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Feb 14, 2018 12:40 pm    Post subject: Reply with quote

I'm on the fence and have been since hitting 100k. If I had a 3.6 I'd deffo be on thicker, but I've seen too many high miler 3.4s that folk have run on mobil 1 to sway me to the dark side.
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Robertb
Long Beach


Joined: 01 Sep 2003
Posts: 6131
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Wed Feb 14, 2018 12:42 pm    Post subject: Reply with quote

NLW73 wrote:
Martin996RSR wrote:
I used to get a puff of smoke on startup from mine, I tried 10W40 and it didn't help, and then I had a catastrophic AOS failure. Once the AOS had been replaced with a new one, the smoke on startup thing went away.

Did you replace yours as part of your rebuild?


I am not sure to be honest martin so will check

AOS - is that the air oil separator?


AOS went on my 4S. Frightened me to death, engine made a ghastly screeching noise (apparently air being sucked in through a small gap).

A cheap £80 part, but requires the engine to be dropped to fix, though some models can be done in situ.

So over £1k for some pointless bit. So well worth doing if you have the engine down for some other reason.

But yes, oil consumption had increased quite a lot beforehand.
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NLW73
Österreich


Joined: 27 May 2014
Posts: 988
Location: Yateley


PostPosted: Wed Feb 14, 2018 12:51 pm    Post subject: Reply with quote

there is a little pressure vacuum when you take the oil cap off but it does not smoke. the idle seems to drop a little but am told that is normal

will try the different oil route first and see if that makes a difference

then maybe look at the AOS change route.
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captain caveman
Silverstone


Joined: 26 Jul 2017
Posts: 105



PostPosted: Wed Feb 14, 2018 4:44 pm    Post subject: Reply with quote

I'm using 10/50 millers.
What I've noticed is when cold the engine idles lower to the point where you can feel it in the car.
It also turns over slower when starting from cold and since using it my starter let's a screech as the engine starts. (Don't sound nice)
T
At £120 it can say in there for the time being but on the next service think I'll be going back to 5/40.

On the plus side oil pressure is up at around 2bar at idle and just over 4 at 70mph
Engine sounds and feels soother to.
 
  
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alex yates
Donnington
Donnington


Joined: 06 Mar 2014
Posts: 12050
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Feb 14, 2018 4:54 pm    Post subject: Reply with quote

Your starter motor schreech has nothing to do with the oil. It's clutch dust on the starter shaft and just needs cleaning.
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captain caveman
Silverstone


Joined: 26 Jul 2017
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PostPosted: Wed Feb 14, 2018 5:26 pm    Post subject: Reply with quote

Anoyingly it's only done it's since I had the oil and ims changed a couple of weeks ago.
 
  
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alex yates
Donnington
Donnington


Joined: 06 Mar 2014
Posts: 12050
Location: 4,000 holes in Blackburn, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Feb 14, 2018 5:32 pm    Post subject: Reply with quote

captain caveman wrote:
Anoyingly it's only done it's since I had the oil and ims changed a couple of weeks ago.


Looks like whoever did the job has blown the clutch dust from your bell housing area into the starter motor.
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