Which engine oil ???

[shadrach74]

Originally Posted by DFW02S

Mobil1 15-50, track and street, 5,000 mile intervals.

No disrespect, but of all the opinions listed, this is absolutely the worst recommendation I've seen. I would never run oil that heavy unless I was running a car with 250,000 hard miles in Dubai...in the summer.

What is your reasoning for running oil so for outside the parameters of what Porsche recommends and moreover with a viscosity far beyond what your modern engine was designed for?

[Meir]

Originally Posted by shadrach74

No disrespect, but of all the opinions listed, this is absolutely the worst recommendation I've seen. I would never run oil that heavy unless I was running a car with 250,000 hard miles in Dubai...in the summer.

What is your reasoning for running oil so for outside the parameters of what Porsche recommends and moreover with a viscosity far beyond what your modern engine was designed for?

That's funny.
Looks like this subject always creates an argument.
I remember when I firs joined the forum I asked the same question.
Based on the answer I got, I decided to go with castrol 10-40. But I live in Florida
What intrigues me (and I'm still looking for an answe) is how come most of the people are using 0-40, when the owner manual is not recommending this option.
Yes, look at your manual and you will find out recomendetion for oil weights based on ambient temperature.
15-50 is on the list. 0-40, not.
So where did it came from
BTW you can find the same information in the Bentley book.

[Flavor 987S]

Originally Posted by Meir

That's funny.
Looks like this subject always creates an argument.
I remember when I firs joined the forum I asked the same question.
Based on the answer I got, I decided to go with castrol 10-40. But I live in Florida
What intrigues me (and I'm still looking for an answe) is how come most of the people are using 0-40, when the owner manual is not recommending this option.
Yes, look at your manual and you will find out recomendetion for oil weights based on ambient temperature.
15-50 is on the list. 0-40, not.
So where did it came from
BTW you can find the same information in the Bentley book.

Meir, the short answer is, that Porsche is updating their recommended oils list all the time (yearly) for brand and viscosity. So, our Owner's Manuals become out dated in short order. Same is true for recommended service intervals.

[Meir]

Originally Posted by Flavor 987S

Meir, the short answer is, that Porsche is updating their recommended oils list all the time (yearly) for brand and viscosity. So, our Owner's Manuals become out dated in short order. Same is true for recommended service intervals.

good answer.
thanks.

[rem503]

I'm trying 5W-40 Valvoline full synthetic. We drive in spring, summer and fall in northern Ohio. It's on sale at Napa for 5.40 per quart.

[shadrach74]

What flavor said is absolutely true. Also I would add that the XXW number is a measure of of how the oil flows (or doesn't flow) at a 100df. The -XX number is a measure of how oil flows at operating temp 212df. So 10w-40 and 0w-40 perform (read flow) quite differently at 100df, but exactly the same at 212df. My primary concern is start up lubrication. Which almost no oil does adequately.

While I use Blackstone for analysis on several vehicles and enjoy their plain speaking way of explaining each annualized sample, the are still measuring trends.

There is no logical reason I can think of to run 15W multigrade in a water cooled engine with modern tolerances unless those tolerances have widened to such a degree that it is required to maintain pressure. Even if i lived in Phoenix, I'd not be running
15w-XX. At colder temps, much of an oil of heavier XXw is likely pushed right through the bypass.

[DFW02S]

Originally Posted by shadrach74

No disrespect, but of all the opinions listed, this is absolutely the worst recommendation I've seen. I would never run oil that heavy unless I was running a car with 250,000 hard miles in Dubai...in the summer.

What is your reasoning for running oil so for outside the parameters of what Porsche recommends and moreover with a viscosity far beyond what your modern engine was designed for?

To be clear, it wasn't intended as a reco' - it was just what I use, although his question is clear.

The M96 engine itself tends to run hotter than a straight or V-6, then add in the Dallas ambient street and track temps often exceed 130 through 4 months of the year. The Mobil1 15-50 is measured to have a high film strength. (Couldn't get Castrol at last oil change)

My oil analysis from Blackstone are coming back clean, so there are my reasons.

Porsche recommends oil changes at 15k miles and I don't do that either.
And a "viscosity far beyond what your modern engine was designed for" .... maybe you can support that, because there is support out there for 15-50.
Modern? No vario-cam and an IMS in my M96. That should end the "modern" discussion.

[spongebob]

Originally Posted by shadrach74

No disrespect, but of all the opinions listed, this is absolutely the worst recommendation I've seen. I would never run oil that heavy unless I was running a car with 250,000 hard miles in Dubai...in the summer.

What is your reasoning for running oil so for outside the parameters of what Porsche recommends and moreover with a viscosity far beyond what your modern engine was designed for?

Hmmm, the Ims problem was pretty unknown when the manual stated 15-40w.
Not only due to the cars age at that time I guess