neanicu

I agree,the most wear happens at start up. BUT...unless you have your car parked outside in below 0 F temperatures,5W will flow just as well as 0W on start up. Unless,as Kosmo said,you can find a 0W-50 oil...

kosmo

switched from M1 0-40 to 5-50 for my cayenne tt. So far I've notice about 50% decrease in consumption. I still need to drive it in the warmer months to get more data.

kosmo

i was shocked that my dealer stocked it for $7.99/qt. plus PCA members get 10%. cheaper than online.

kosmo

yup very marginal difference.

the funny thing is that these cars are equipped w/ summer tires. so who the hell are driving in the freezing temps?!!!

LexVan

We call this a win-win!

LexVan

There are lots of 0W50 oils out there. NONE are Porsche approved. If that matters to you.

But, the rub is, that most 0W50 oils are "race oils". Race oils are significantly different (additive package) than street oils, and have much different properties and drain interval expectations, since race cars are drive a few hundred miles, and then re-serviced.

kosmo

and someone PLEASE teach me how to do a multi quote. Help me!

neanicu

I think it's important to use an oil that is Porsche approved. For piece of mind,if nothing else.
But I certainly wouldn't want to have a 40 weight oil when hot that had sheared to a 30 weight oil after 4000 miles(just an example,I don't know exactly how long it takes for it to shear. I guess it depends on the usage of the car-track/street/temperatures).

orthojoe

Napa? I'll ask them next time. Thanks!

Bought from amazon last time.

Really? I'll ask them too, Thanks!

bottom right corner of each posted message is a '+'. Click on the + of each message you want to multi quote, and then hit reply.

GreenLantern

I use Motol X-cess 8100 5W40 not because I wanted a 5W40 instead of a 0W40, but because I preferred the chemical make-up of Motul X-cess 8100 over Mobil 1's offering.

And, it's a factory approved oil. There are many factory approved oils. I really don't think you can go wrong with any of them, in the end it's about which one helps put you mentally at ease, and sleep better at night.

KINGSRULE

+1

Also, in general, the smaller the amount between the 2 numbers in the viscosity spec there will be less shearing of the oil....

Mech33

I'm sure Porsche knows what they're doing spec'ing Mobil 0W-40 in their track-warranted GT3 motors. Wear is a combination of many factors, including the small incremental wear every time you start the car. I'll be sticking with 0W-40.

GreenLantern

Yes, and no. They definitely know what they're doing... And that's why they have a lengthy list of fully approved oils.

As to why they use Mobil 1 0W40, I wouldn't go as far as saying it's because it's the absolute best one for their engines. It's likely a balance between good for engine, and corporate sponsorship / partnership.

Note: I am in no way dismissing Mobil 1 0W40 as a good oil. It's a fantastic oil. Just subjectively not good enough for me when compared to other fully approved Porsche oils.

Kevin

Folks LexVan is correct in his Post #6.. Likewise one can spot the 5W50..

Over the years I have noticed that if we run the 5W oil the engines tend to burn less oil.

For those that are diehard Mobil 0W40 fans, AND have a little more oil burn > on you next oil change mix the weight 50/50 0W40 and 5W50. The chemistry is the same, but your ending shear and thickness of the oil 2.5W45 (good estimate) will reduce your oil burn. It is important to add the 5W50 if you need to refill.

When you study the various oils and VOA, you will find that oil manufacturers have different viscosity at start up and thru the heat range. Motul runs thin vs Mobil, Castrol runs thick vs Mobil.

Biff_Malibu

They use lighter weight to cover the broadest spectrum of temperature ranges (the 0w aids in sub freezing climates), aid in fuel economy (HUGE factor), and provide adequate protection where the car will be used most often (the street!).

If you are not in a climate where the car will be driven in below freezing temperatures, and you intend to drive it hard, or track if, 0w40 is not the "best and only choice".

I would run a 5w40 (which will have higher shear resistance than a 0w40), or a 5w50. If the oil is Porsche approved, at that point you shouldn't have any concerns regarding the composition and durability of the oil.