M1 5W50 is on the Porsche approved list. It's actually factory fill on the 997GT2RS. There is a visible difference in idle oil pressure between 0w40 and 5w50 when hot at the track. Been there, done that...

 

Porsche 996tt: Oil is getting low can i top up mobil1 5W50 synthetic while the car has 5W40?

 

Yes, no problems with mixing todays synthetics with even different viscosities

 

Thanks alot john ☺

 

^ you might even want to consider the next change swapping to a fresh fill of mobil 5/50. i'm convinced the car likes it infinitely more than 0/40. that stuff ( 0/40 ) is SO thin in very high ambient heat, i can FEEL it shearing

 

112,000 moded miles been running Rotela T6 since 32,000 miles. No rattles, I use right at 1/2 liter in 5,000 miles. I will never switch. I run it in my V10 Touareg, my CTS-V, 944 Turbo, F250 Turbo Diesel and all my bikes. No brainier.

 

hey man... don't you work on 650 triumphs?? i seem to recall us discussing that a cpl years back? though i'f I'm mistaken, sorry, and never mind.

i bought two 5 gal ( litre?? ) jugs of t-6 and have not touched em yet. i fell in love w castrol edge 5/40 & 5/50 so i have a cpl yellow t-6 jugs just takin up space

wonder if i can dump that ( slowly, ..as its a 10 year supply lol ) in the 'ol '66 tr6sr

 

Castrol 03101 EDGE 0W-40 Synthetic Motor Oil - 5 Quart
Amazon 22.97/5 qt jug

 

In street cars its all about flow at startup. Thats where the wear happens.
Especially turbocharged cars.
0W-anything is actually TOO THICK at startup temperature.
Why one would go to 5w or 10W or for Gawds sake 20W+ is going backwards.

 

That is a blanket statement full of generalities and little data. Not trying to be a dick. What are you referring to as cold? Because a cold start in Alaska versus Arizona are vastly different which is why porsche offers a chart based on temps. On that chart is 5w oils. I can tell you for a fact that I saw zero difference in delay of oil pressure indication between the 0w and 5w in the exact same colorado winter temps. And in addition, those temps on the chart are not even taking into account that the car is often in a heated garage. Once the car is warmed up, it doesn't much matter unless you leave the car out all day in freezing weather afterwards. The most extreme weather conditions are represented in that temp chart as in being left outside all of the time.

 

i dont know much about cold weather temps relative to using a "5" on the lower end of oil types. but i can say with a fair amount of unscientific anecdotal certainty, that a 5/40 or even a 5/50 quiets down considerably, not only the *normal* chain rattle, but also a terrible "screech" at startup ( pre-pressure ) that my car exhibits.

i no longer use, and will never again use 0/40 for anything other than a necessary topoff, and only if i don't have any 5/50. though to vagscums point, i might use 0/40 if i kept my turbo outside parked next to the snowmobiles and the mush dogs lol

 

the reason for going for a higher cold weight, if appropriate for the ambient conditions, is it helps give the oil a greater temp vs shear capability...

 

Have to mention that for operation in cold climes, with temps in the -25C range, Porsche recommends 0w-40 oil.

Frankly I'd switch to 0w-40 even before it got that cold. Back in Dec. 2014/Jan 2015 I was in the midwest with my Turbo and with 5w-50 oil in it (not a typo for 15w-50!) and when ambient temperatures down in the single digits I was a bit fearful that the 5w-50 oil might be too "thick".

But the engine cranked and started just fine even when left out overnight in 1F temperature.

But still were I faced with using my Turbo that cold of temperature again I'd switch to 0w-40 oil just for some peace of mind.

 

Can Anyone recommend a 5w-40 oil for my "08 Cayman S TPC turbo. 15k miles

Should I use the Mobile 1 Diesel Truck Syn blend?

 

From Pwdr's post above "M1 5W50 is on the Porsche approved list."

Why would you use anything else if you wanted to run "Thicker" oil.

I even use it here during the harsh California winters.