FLM911

So the GT3 went in for it's first annual service with the Porsche dealer this week, and instead of using the factory fill mobil 1 0W40 they filled it with 15W50 (mobil 1).

I asked why they didn't fill with an approved Porsche oil (0W or 5W as the manual says), and the response was that the 15W50 is a better oil for track use (car does see track duty) as it is much better at the higher temperatures, especially here in the south east USA.

They have offered to swap it out and fill with 0W40 no problem.

Anyone running with the 15W50 mobil1 in the .2 GT3, and any issues? I'm not the expert on oils, but was surprised that the dealer wasnt following the policy Porsche laid down for the engine.

ADias

That's news to me. My dealer switched to Mobil 1 5W40 - on all cars.

cfjan

I'm surprised that dealer didn't take the "safer" choice. i.e., use oil on the approved list.

Some performance shops around here feel that GT3 engines should use 15/50 for the extra protection at high temp, but they are not official dealers.

From my understanding, 15/50 is used in many Cup as it is run under high stress condition most of the time, as well as lacking the VarioCam of the street cars. (Please correct me if I'm mistaken) For street GT3, some feel that 15/50 is too thick for for VarioCam to function properly.

No idea if that's true or not, just info that I gathered from reading the forums.. !

MJSpeed

Mobil 15W-50: (From Mobil1 website)

"Mobil 1 15W-50 is recommended for high performance vehicles including turbocharged and supercharged engines where a thicker oil film is desired. Its high viscosity provides outstanding performance in high-revving, high-temperature conditions."

sin911

Interesting...

Does anyone have any idea on tracked Carreras? I've been running 0W-40 as suggested Any info would be helpful.

The Mobil website doesn't provide much information

FLM911

That's what the chap at the dealership said also - it's used in the cup cars, and will help the GT3 engine over time by providing better lubrication when the engine is running at high stress and temps during track use. He said the 15W oil is fine for every Porsche except the VVT turbo's. Only restriction would be where the air temps were very low which is where the 0W or 5W then makes sense.

911rox

15w-50 will not be thin enough to allow the variocam to work correctly and may not give enough protection on startup... If they can't do 5w-50 go back to 0w-40...

I spoke to a Mobil engineer about the whole 0w-40 5w-50 deal... He said that the 0w-40 was used because the thinness increased fuel economy, provided slightly better start up protection etc but for track use the 50 rating was so much more important for protection... He also said that the whole start up wear issue was a non issue with 5-50 because apart from great protection, most pople don't start them several times a day like DDs, thus wear was far less... fewer starts

ps cupcars don't have variocam if I recall correctly....

Michael-Dallas

Doug Hillary posted this last year on BITOG when he attended the 38th annual 24 hours at Nurburgring:

You can read the thread here.

Michael.

997gt3north

If you live where it is hot (SE) and you go to the track 5/50 or 15/50 is fine. If you live in the NE where spring and fall days , never mind a winter around the block to keep the car alive, can see tempts just above freezing, never mind below, remove the 15/50 immediately. Been there done that never again - trust me remove it - or at minimum change out the oil over the winter season.

Serge944

Forget the approved list. The EPA has mandated reduction of zinc in oil to prolong cat life. The latest SM reflects this.

If the government mandates ****, there will be **** in your brand new Porsche's sump from the factory. No way around that...

I run Swepco 306 tractor oil.

911rox

Originally Posted by Doug Hillary
Hello,
I thought this may be of interesting to some

I am in Nurburg is Germany - at the Nurburgring. The 38th annual 24hr race is underway. some things that may be of interest

1 - Mobil1 0W-40 is the oil used by Porsche in their race cars - including the new Hybrid! It is an "off the shelf" version! This was confirmed by the Engineers from Weissach when I was in the Pits!

..........

The motorsport technician at the dealership said the same about cup cars but the thing to keep in mind is lower top end viscocity = higher horsepower (less friction) but also greater wear under extreme conditions... They get new pistons, liners etc etc every 40 hours of use...

For a keeper, I'd rather the 5w-50- take the penalty on fuel consumption and horsepower and increase protection as I'd rather not have to rebuild any time soon...

IRguy

When my gt3rs arrives I will switch to 0W50 ENEOS oil.
http://chrysanstore.com/enmooil0wgra.html

ATL Fahrer

I think I'll stay with what the sticker says on the car - at least until the warranty runs out

SH || NC

It's unbelievable a Porsche dealership would a non-approved oil, when M1 5.50 is an approved oil and is available in the US. Can you scan and post your invoice where it reads 15.50?

ralt12

We use Mobil 1 0w-50 in our Cosworth DFZ/DFR's, as per the recommendation of Nicholson McLaren Engines.
Note: not recommended for everyday general street use where vehicles use catalytic exhaust converters.
But if you want a great oil for your track car, this one fits the bill.
http://www.mobiloil.com/USA-English/...ing_0W-50.aspx