JCviggen

As well it should! It's as near as makes no difference the same power, same weight, same amount of aero and literally the same front suspension. It's the same level of performance done in a slightly different way. Only in places like the Nurburgring or particularly bumpy tracks will the 911 have an advantage. The driver and state of the tires will be the only real differentiating factor.

I've driven my .2 manual behind a 4RS and I've driven a 4RS behind a 992 GT3. Straight line it's all the same and the rest will be a slight difference depending on the type of corner being taken.

Warwick Morris

FIIK

DIS295

I assume these engines are wet sump. Proper oil level in wet sump engine is a tension between enough oil to avoid loss of oil scavenging due to g forces, and too much oil causing frothing and overheating due to windage. Also windage contributes to small power losses. Apparently Porsche has found that these recommended oil levels are the best compromise.

Warwick Morris

RS is dry sump. 9A1 and 9A2 are wet sump (still P recommend one below full for track work)

lilbza

I thought the 9A2 from the 718 GT4 was dry sump?

Odin

GT4 uses a bored out 991.2 Carrera S engine (9A2), which is wet sump.

lilbza

Yes but it's also not the exact same engine. It was modified for the GT4.

Odin

A bolt-on dry sump? Sounds like a not ideal solution. And why the GT4 isn’t a Porsche Motorsport product, not born in Flacht.

Warwick Morris

Both the 981 and 718 have a very innovative wet sump with multiple oil pickups. Nonetheless it still has a sump which you can see when you get under the car, It's completely safe for the track and runs in the Clubsport cars on slicks for thousands of kms of 10/10ths racing without issue. The RS has the GT3 motor which has a remote oil tank, Both motors are great. Please move on.

TDT

Exactly

matttheboatman

Speaking of oil, I read where the GT4RS now requires Porsche C40 standard oil, which for Mobile 1 is the 0w-40 ESP X3 designated type. The reason I point this out is that I read that you are not to mix the old A3 standard 0w-40 with this new C40 standard. There is a long discussion on the topic in another post, and I'm sure some will say to ignore this directive. Nevertheless, Porsche has made the C40 the required standard on European cars and now American cars too, and both Porsche and Mobile 1 say don't mix it.. You local dealer is probably still using the non-C40 type and I have only ben able to find the X3 labeled Mobile 1 at a few places online.

Mobil 1™ ESP X3 0W-40

Advanced Full Synthetic Engine Oil

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Mobil 1™ ESP X3 0W-40 is an advanced full synthetic engine oil specifically designed to provide outstanding performance for high powered engines, providing outstanding engine cleanliness, wear protection, strong durability and advanced fuel economy*. Mobil 1 ESP X3 0W-40 is our latest technology developed in cooperation with Porsche, one of our key European Original Equipment Manufacturers (OEMs). Mobil 1 ESP X3 0W-40 has been expertly engineered to help prolong the life in new emerging gasoline powered European vehicles.

*compared to our Mobil 1 ESP Formula 5W-30 / Mobil 1 ESP 5W-30

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• 
  Product Data Sheets (PDS)
• 
  Safety Data Sheets (SDS)

Features and Benefits

Mobil 1 ESP X3 0W-40 is made with a proprietary blend of leading edge components formulated to be fully compatible with the latest Gasoline Particulate filters (GPF's). Mobil 1 ESP X3 0W-40 has been designed to help deliver outstanding performance and protection in conjunction with advanced fuel economy benefits. Key features and potential benefits include:

**Based on industry and OEM standard engine tests



Features

Advantages and Potential Benefits

Active cleaning agents

Helps to prevent the buildup of harmful deposits to enable long and clean engine life**

Provides outstanding engine cleanliness and sludge control

Outstanding high-temperature thermaland oxidation stability

Helps to reduce oil aging for protection throughout your oil drain interval

Enhanced frictional properties

Provides fuel economy improvement versus Mobil 1 ESP Formula 5W-30

Excellent low temperature capabilities

Quick cold weather performance to help provide protection at start-up

Wear protection

Provides outstanding wear protection**

Applications

Mobil 1 ESP X3 0W-40 is recommended for high-performance engines requiring GPFs (gasoline particulate filters).

• Mobil 1 ESP X3 0W-40 can only be used in the vehicles for which it is approved. It is not backward compatible with vehicle engines requiring an A40, C30 or C20 . ***



*** Always consult the owner's manual of the vehicle for the manufacturer's recommended viscosity grade and specifications

Specifications and Approvals

This product has the following approvals:

PORSCHE C40

MB 229.31

MB 229.51

MB 229.52

GM dexos2

VW 511 00



This product meets or exceeds the requirements of:

ACEA C3

FIAT FIAT 9.55535-S2

API SN Engine Test Requirements
APISN PLUS

Properties and Specifications

Property



Grade

SAE 0W-40

Density @ 15.6 C, g/ml, ASTM D4052

0.846

Flash Point, Cleveland Open Cup, °C, ASTM D92

230

Hi-Temp Hi-Shear Viscosity @ 150 C 1x10(6) sec(-1), mPa.s, ASTM D4683

3.8

Kinematic Viscosity @ 100 C, mm2/s, ASTM D445

14.1

Pour Point, °C, ASTM D97

-48

Viscosity Index, ASTM D2270

204

Health and safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com/psims/psims.aspx

Odin

Got 1L of the good stuff with the car👌🏻

GrantG

Regarding torquing center-locks at the track. This is totally unnecessary if you trust they were installed properly (and always a bad idea when the car is not lifted).

The GT4 RS uses the new Centerlock III system that automatically pops out and locks when torqued (introduced with 992 GT3). With the CL’s on the 997 and 991, it was common that the locking mechanisms were not locked properly (my local tire guy went around the paddock at a PCA event and found that more than half the GT cars with CL’s had at least one wheel that was dangerously unlocked). No longer an issue (don’t even have to check).

BTW, while many of us did/do torque 5-lug wheels between sessions at the track, this is also a mistake. When coming off the track hot, it’s almost always possible to tighten the lugs a bit more before the wrench clicks. Doing this several times a day results in the lugs being badly over-torqued by the end of the day. Just do it once when cold before going on track and not again.

Adrift

Yeah, my tech told me the new oil is still required even if you ditched the GPFs due to interaction with the catalytic converters.

Odin

Great info👌🏻 Didn’t know that about GT4RS CL’s