James_944

I am beginning to wish I had not started it.

There are just so may different opinions that it leaves me a little confused and wondering does anybody really know...... or do they just know what they know..............?
The only subject worse than this is the one of using $1000 Hi-Fi interconnects using gold contacts, oh and the one of having to model every design dream in Archimate.

Maybe I should stick to gut feeling, experience and olive oil, so long as it is Italian - none of that cheap Greek crap. ;-)

James_944

In fact if you read http://www.porsche.com/usa/accessori...weditions/oil/ then none of these oils are for 944s!

Oh well.

jagdhund

Ya, I can't decide on an oil either. About to do the first oil change.

I was thinking a 20w50 mobile 1 but a quick search only shows motorcycle oils.

Tom R.

That's what I thought. Thanks. Works for me. I got a $5 coupon off the Valvoline site.

Changing oil tomorrow, tracking car Saturday.

mike77

My 928 S4 owners manual states 5w40 covers all ambient temperatures and is an all year round oil. I use it in my 928 and my 944

James_944

My 944 manual suggests that 10W-40 is going to be hard to beat for all round use in the UK.

Sticking to Mobil that means going semi-synthetic with Super 2000 which has 850ppm ZDDP.
Again, from here: http://forums.tipec.net/viewtopic.php?f=25&t=13839

I just do not know....... They all have advantages it seems. Hmmmmm.

Aivar88

10w40 Motul , in Estonia all year. (winter ~minus 15 , summer ~plus 25)

hacker-pschorr

There is zero debate on that subject, biggest waste of money on the planet.

Where are you searching? Every Mobil 1 product here:
http://www.mobiloil.com/USA-English/...duct_Guide.pdf

Excellent oil, I've been using it for many years. The regular and the synthetic.

In my cars that travel less than 4k miles per year, I don't waste my money on the synthetic.

Time to beat this horse again....

The "old" standard for ZDDP is 1100/1200 ZDDP. 850 is the "current" EPA friendly standard.

See the PDF I liked to above, you want an oil with at least 1100-1200 for our flat tappet lifters.
I would love to see a copy of that, I'm looking at the last edition of the WSM that covers up to the 1995 GTS:

"Quality HD oils to API classification SE. For all year operation mulitgrade oils of viscosity SAE 15w-50 or 20w-50 (latter oil not for constant temperatures below -15C).

All 944's and 928's use the same rod bearings.



EDIT - found an image from a 928 owners manual (944's should look the same).

Yes, 10w-40 is listed under "fuel efficient oils" - not something I would put in my car:

mike77

Ok so here is what is in my 928 S4 1990 UK handbook. 5w40 covers all temps. For the record I'm using Miller's Trident 5w40 which is over 1300 ZDDP according to the guy I spoke to at Millers. It is also pretty cheap for fully synthetic at £25ish for 5 litres. But I picked it based on ZDDP levels not price.

Here is what the handbook states.

Fuel-economy oils
Fuel economy oils require low viscosity at low temperatures and high thermal stability at high temperatures.
As high-performance oils, these oils are manufactured only as synthetic or hydrocrack oils at present.
On account of their low cold viscosity, these oils are also high-lubricity oils and are termed “all season fuel economy oils” in the Porsche approval.


I haven't got the handbook for my 944 but use the same oil in both.

James_944

20W-50 instead of 10w-40...... Surely that just means it is able to maintain viscosity at higher temps?
If ZDDP above 1000 is needed then it looks like a non-Mobil solution is required. Shame. OK if you are in the USA, lots of Mobil grades to choose from. Is the 10w-60 really too much?

Dougs951S

*Beats head against wall* GAHH people! Stop running 10w40 in a 944 or 928 engine, they use the same rod bearings and they do NOT like anything less than a 50 weight oil, period. There is no discussion and no argument or opinion here, unless you live in the arctic circle, run 15w50 or 20w50 with lots of zddp all year round and your motor will be happy. 40 weight is simply too thin. End of story.

67King

No, the important number in realm of con rods is HTHS, which may or not be as thick or thin. LIke I had said earlier, the Millers 5w40 is thicker than most other 10/20w50's out there. Motul 300V is the same way. Sorry, this is not an opinion, it is a fact.

JustinL

I've been enjoying Mobil 1 V-twin 20W-50.

James_944

Yep got that but I am not running any oil in there at the moment.

Millers site responds with this for a 944:
Products : Classic Mini Oil 20w50 (Code 5489)
Energy Efficient Nanodrive : EE 10w40 (Code 7708)
Trident : Trident 5w40 (Code 7625)

Which does not help either as they recommend more than 1, and no mention of HTHS or ZDDP.
So ZDDP is to be high 1000+ better and HTHS is to meet ACEA but not too high? What is the consequence of HTHS being too high? Battery life? Starter motor?

Nothing less than a 50 weight means the 60 is ok to me but too high HTHS?

Would it just be fair to say you guys simply disagree?

Very confusing.....

Dougs951S

I am aware of that, I suppose I spoke too soon and too generally, I was broadly referring to MOST off the shelf parts store type 40 weights, I am well aware that viscosity range is a poor indicator of actual oil viscosity and its ability to resist shear under the high loads seen in a hydrodynamic bearing.