Engine Oil - 2.7 - what do you use

[333pg333]

It's funny that in the handbook scan you post they state that they are high performance oils. I think that this was a typo in fact, because I looked through quite a few other year's handbooks and none of them listed the Fuel economy oils as being High Performance.
I'm get the idea that you are being devil's advocate here rather than basing your statements on any factual evidence. Whereas I have based mine on factual evidence provided by leading people in the field. It's all just words of course. I can only tell you that there has been no evidence of excessive engine wear or failures due to using eg 20w/50 multigrade oils where there has been plenty of the reverse.
Perhaps you have a vested interest in 'Synthetic' oils? haha

 

[Copperman05]

ORIGINAL: Hilux

How, and if they do - how much of a saving in fuel use?

Dont believe it!

Because low viscosity oils create less drag on an engine, in other words its easier for the engine to turn, because its easier it uses less fuel and can also increase HP.

As to how much, wel I guess that would depend on the engine, size of car, way you drive, etc.

 

[Copperman05]

ORIGINAL: 333pg333

It's funny that in the handbook scan you post they state that they are high performance oils. I think that this was a typo in fact,
Perhaps you have a vested interest in 'Synthetic' oils? haha

Come on its not a typo, I'm providing you with my evidence and your saying its a typo, do a search on low viscosity synthetic oils and you'll see its not a typo.

Before you guys were hailing Porsche as the last word on oil now they have been found to say stuff that goes against what you believe, you are discrediting the source. Come on, its there in black and white.

Porsche calls them 'High performance oils' because they are high performance oils.

I have no vested interest in synthetic oil, just an open mind....

Edd

 

[Neil Haughey]

ORIGINAL: Copperman05

Because low viscosity oils create less drag on an engine, in other words its easier for the engine to turn, because its easier it uses less fuel and can also increase HP.

Not always true as a thin oil will shear more easily and then you will be running metal on metal, less power and ultimately reduced engine life. The extra fuel economy is ISTR really only apparent when the engine is cold, but as we all know this is also when any engine uses up a lot of fuel.

 

[Copperman05]

Synthetic oil does not shear as easily as mineral oils, even low viscosity oils. So in fact using a syntheitc oil would actually do the opposite of what you say.

 

[Neil Haughey]

No offence but just where are you getting these 'facts' from? It sounds to me like you are just making this nonsense up from 3rd hand pub knowledge.

My point if you bothered to read it says nothing about mineral V semi-synth V synthetic. I am only talking about viscosity. Like 944man said I am not going to argue with you, since you are clearly the worlds greatest expert on these things.

Just ask ppl who race these cars many of whom have been racing cars for the past 20 or 30 years which oils they use? Hint they do not use 0w or 5w oils, and mostly do not even bother with synthetics either.

 

[Neil Haughey]

Read it
http://www.atis.net/oil_faq.html

 

[Hilux]

Because low viscosity oils create less drag on an engine, in other words its easier for the engine to turn, because its easier it uses less fuel and can also increase HP.

As to how much, wel I guess that would depend on the engine, size of car, way you drive, etc.

I accept that but consider it negligible however Neil is correct when he says

Not always true as a thin oil will shear more easily and then you will be running metal on metal, less power and ultimately reduced engine life. The extra fuel economy is ISTR really only apparent when the engine is cold, but as we all know this is also when any engine uses up a lot of fuel.

This is particularly true (as I keep saying) in older engines built to less exacting tolerances at the time of manufacture compared to todays cars that have now done 120,000 miles plus and are a bit worn!

 

[Copperman05]

ORIGINAL: Neil Haughey

No offence but just where are you getting these 'facts' from? It sounds to me like you are just making this nonsense up from 3rd hand pub knowledge.

My point if you bothered to read it says nothing about mineral V semi-synth V synthetic. I am only talking about viscosity. Like 944man said I am not going to argue with you, since you are clearly the worlds greatest expert on these things.

Just ask ppl who race these cars many of whom have been racing cars for the past 20 or 30 years which oils they use? Hint they do not use 0w or 5w oils, and mostly do not even bother with synthetics either.

Ok you have some strong feelings on the matter, if my opinion offends you then I'm sorry but thats all it is, my opinion. You are intitled to yours of course, I dont pretend to be an expert on anything, these views are based on what research I've made when choosing the right oils for my 944.

The last 20 post or so have been about the differences with mineral oil v synthetic, as that is what we were discussing.

True different oils will be required for racing but thats another story altogether isnt it?

 

[Copperman05]

Paul, it wasnt me who decided to call these oils 'Fuel economy oils' it was Porsche, and I'm not saying that they are great for saving fuel.

The issue was whether these low viscosity synthetic oils such as 5w-40 were suitable for these cars. Some here said they werent, I disagreed. I also found that infact the low viscosity synthetic oils were actually recommended by porsche in my 944 manual.(as posted in my scan)

Porsche refers to them as 'all season fuel economy oils'. You asked me why they were fuel economy oils, I told you, I didnt recommend you use them for this purpose, in fact I think Porsche should have just called them synthetic oils and saved all the confusion.

Edd

 

[dirtydirtyharry]

Fellas, I just want to say congratulations on a brilliant thread. []

I have just spent about an hour reading that and I now feel shattered!!! [&:]

ps, I think you are all correct []

 

[AntB]

Completely agree - great thread.. lots of knowledgable people here....

I think this thread should have a sister thread, where you just list Car, engine, milage, oil used, type of driving... That wat we will see exactly what people use...

Cheers

 

[AntB]

....and here it is []

http://www.porscheclubgbforum.com/tm.asp?m=462059

 

[333pg333]

ORIGINAL: Copperman05

ORIGINAL: 333pg333

It's funny that in the handbook scan you post they state that they are high performance oils. I think that this was a typo in fact,
Perhaps you have a vested interest in 'Synthetic' oils? haha

Come on its not a typo, I'm providing you with my evidence and your saying its a typo, do a search on low viscosity synthetic oils and you'll see its not a typo.

Before you guys were hailing Porsche as the last word on oil now they have been found to say stuff that goes against what you believe, you are discrediting the source. Come on, its there in black and white.

Porsche calls them 'High performance oils' because they are high performance oils.

I have no vested interest in synthetic oil, just an open mind....

Edd

Don't be literal. Of course I wasn't implying that Porsche had printed that by mistake. My point being was that in many other year Owner's manuals that I have looked at recently, none of them classed the 'Fuel economy oils' as High performance oils. Hmmm....strange isn't it? That's why I made the light assertion that it was a typo. In fact I suspect that Porsche changed them in the O-Manuals because they realised their mistake and didn't want to have to carry the costs of destroyed engines by recommending these as Performance oils, which they clearly are not.
As for evidence, the only thing that you've produced is that one copy (suspect as it is) of this particular handbook. You've not proffered any hard evidence in the face of quite a few other people doing so and referring you to links of Expert testimony stating that using these low visc and often synthetic oils is detrimental to our flat tappet motors.
As for hailing Porsche as the last word on oils, well it depends on what era you're talking about. There was a change at Porsche during the 1980's where the accountants stepped in and the 'Ethos' seemed to change. They were very happy to get into bed with Mobil and this may be the reason you are reading certain recommendations? You say with unwavering certainty, yet no evidence, that these synth low visc oils are 'High Performance oils'. Why? What do you base this on? An open mind.....?

In truth, reading your replies makes me think that you are only trying to stir up a response for that reason alone.

 

[edh]

If you believed everything in Porsche manuals, we'd all be running with 44psi in our tyres[:-] (I believe the specs for tyre pressure vary significantly between years with no apparent reason)

- and we'd never check the 16V chain & tensioner either []

 

[si30boxsters]

wow some of you guys love your oil!! great thread......keep it friendly. It sounds as if you are all looking for the same thing......the best way to care for your porsche.......plenty of ways to skin a cat!

Having read this prior to an oil service for my S2 I'm plumping for castrol magnatec 10w40 semi synthetic. I want intelligent molecules looking after my engine!


"Castrol Magnatec combines intelligent molecules with part synthetic technology for a stronger layer of protection, keeping your car at its peak for longer. It's Intelligent Molecules:
Provide more protection than other oils during the critical start up period
Cling to your engine forming an extra layer that protects during start up and beyond
Bond to metal surfaces making engine parts more resistant to wear
Provide protection for all driving conditions and styles"

Must be a sucker for marketing!!