hacker-pschorr

Warm weather calls for 50 grade. Here is the owners manual:

Alan

Tomorrow it will be 43C in Phoenix - 'warm' doesn't quite describe it!

Its very easy to see low pressure warnings due to low viscosity hot oils (on most types).

AMSoil 20W50 high zinc (ZROD) works well - I'm not going to mess with it any more... sometimes Kibort is just right

Alan

Don Carter

Suzanne,

Thanks for posting, great information. I wasn't sure how much zinc the T6 product had so good to learn it is a suitable oil for our cars.

Brett928S2

Hi

For what its worth I use a Full Synthetic 15/50 (Fuchs Titan Race Pro R) for my S2 with Nitrous...10/40 and 0/40 etc are MUCH too thin for any 928.. IMHO...

All the best Brett

JET951

Just out of curiosity , does anyone know or wonder why so called semi synthetic or so called fully synthetic engine oils ( in this century ) use the mid last century " Read Dino" ( World War 2 ) oil anti wear additive called ZDDP or some call it zinc / high zinc additive

I thought that ( starting late last century ) that so called synthetic engine oils are made to do a few important things & I would have to put at Number 1 = to keep metal parts away from each other

Things like }

A ) High loaded flat tappet ( pointy cam lobe faces) away from the lifter face ( 944 & 928 )
B) Cam chains away from the teeth of the chain sprockets ( 944twin cam & 928 twin cam )
C ) Pistons away from cylinder walls ( thrust side of pistons particularly )
D) Engine thrust bearings
E ) Valve guides ( air cooled 911 )
F) rocker shafts faces ( against cam lobe ) & their pivot bushes ( air cooled 911 )

All the above receive little or no oil pressure & depend on the engine oil with high oil film strength

But to do this , so called semi synthetic or so called fully synthetic engine oils must have the "Dino" ZDDP oil additive

All the expense & hype around these so called synthetic oils , only to find out they are at a disadvantage without ZDDP

All the effort in having to reduce ZDDP ( for emission reasons ) , even the big switch to Boron early this century appears to have come to a screaming halt , I do not see synthetic engine oil advertising with the words , this engine oil has no ZDDP but lots of Boron ( Boron was to replace ZDDP as a AW package)

So does anyone know how the Boron AW scene is going ? , is Boron still being used ? , is there an engine oil that has high oil film strength that has only Boron & no ZDDP ? , because the oil companies that make racing engine oils only mention ZDDP AW in their oils & they push this & I never see Boron mentioned

I am fascinated by the fact that so called synthetics can NOT stand on their own two feet without a deep last century DINO oil additive

Chalkboss

Alan, I run the same oil as you, it gets very hot here in Sacramento. I noticed a slight bump in oil pressure and engine runs quieter than with Mobil 1 (15W50 if I recall). Did you notice any changes running the Amsoil?

James Bailey

From Car and Driver Nov 2000.....wow that long ago !
" Now that the meaning of "is" has gotten so slippery you need to grab it with both hands, we'd better keep an eye on longer words, too.

One's already gone squirmy on us -- "synthetic," as in synthetic motor oil.

Most guys know two things about synthetic oils. First, the price is three to four times that of conventional oils. Second, they're not real oil, not made from crude.

News flash: Scratch that second part. Now motor oils derived from crude may be labeled "synthetic." But they still cost over four bucks a quart.

Bait and switch? That's the obvious conclusion. Except in this case the advertising ethics people have given their approval.

Here's what happened, according to a detailed account published in the trade magazine Lubricants World. Late in 1997, Castrol changed the formula of its Syntec "full synthetic motor oil," eliminating the polyalphaolefin (PAO) base stock (that's the "synthetic" part, which makes up about 70 percent by volume of what's in the bottle) and replacing it with a "hydroisomerized" petroleum base stock.

Mobil Oil Corporation, maker of Mobil 1, "World's Leading Synthetic Motor Oil," said no fair and took its complaint to the National Advertising Division (NAD) of the Council of Better Business Bureaus. NAD often arbitrates between feuding advertisers on their conflicting claims."

Mobil LOST and then quietly switched to using petroleum base to make Mobil One, not that there is anything wrong with that

MainePorsche

So Jim, Mobil 1 'synthetic' has a petroleum base ?
That would be an improvement.

James Bailey

more info...... " What is synthetic oil?
The easiest way to define what synthetic oil is, is to define what it is NOT. Conventional motor oil as we have known it for the last 100 years or so is derived from crude oil that is taken from the earth with oil wells. Through a complex distillation process the crude oil is refined into many different liquids, or fractions, each having distinct characteristics. Some are very light and are used as fuel (gasoline, kerosene, diesel fuel), and some are heavier and are used as lubricants (motor oil, gear lube, grease). There are many molecular compounds present in crude oil and many of those compounds are still present in the refined product, detracting from the physical properties of that product. For instance, paraffinnic waxes are present in crude-based oil, but contribute nothing to the lubricative properties of the oil. Also, the size of the hydrocarbon molecules themselves are non-uniform in crude-based oils. Synthetic oil contains none of these contaminants and the hydrocarbon molecules are very uniform, giving the synthetic oil base better mechanical properties at extreme high and low temperature (see the sections below on physical properties). By contrast, synthetic oil is not distilled from crude oil. It is made through a chemical process known as the Fischer-Tropsch process, starting with raw materials like methane, carbon monoxide, and carbon dioxide. This process was developed by Germany in WWII, when that country's access to crude oil was very limited.

Grades of oil.
Motor oils are derived from base stocks. That is, a generic oil base is modified with additives to produce a lubricant with the desired properties. A base stock oil with no additives would not perform very well at all. Base stocks are classified by the American Petroleum Institute (API) and fall into one of five categories.
•Group I and II - these are mineral oils derived from crude oil
•Group III - this is a highly refined mineral oil made through a process called hydrocracking. In North America this group is considered a synthetic oil, for marketing purposes.
•Group IV - these are true synthetic oils, known as Polyalphaolefin (PAO).
•Group V - these are synthetic stocks other than PAO's and include esters and other compounds. "


Love the Group III .... " In North America this group is considered a synthetic oil, for marketing purposes. "

MainePorsche

So would what you have said above about Mobil 1 synthetic having a petroleum base put it in Group III ?
Or, is it a petroleum base with PAO components 'added' to it ?

outbackgeorgia

Alan,
You are truly "off the chart" at that temp!

JET951

Hi James , good post , in regards to the Group III, Group IV, Group V ( if any sold to the public ) do these oils have to have or do they have last century "Dino " ZDDP ? for use in the Automotive world as engine oils sold to the public either as street oils or track oils , if so then why ?

mike77

It also appears to state a 15w40, 10w40 and even a 10w30 cover the high end of the temperature range.

Also since that was printed I believe Porsche recommends only A40 rated oils for models from 1984 onwards. They appear to be 0W40, 5W40 and 15W50 from what I can see.

Alan

Unfortunately it gets a lot hotter than that here... record so far is 50C.

Alan

Alan

Yes but in making recomendations for using light modern oils for older models Porsche is clearly totally nuts! it contravenes the original vehicle documentation...

Its only logical purpose would be to get you to buy a new model...!

Alan