Castrol 5w-40 instead of Mobil 0w-40???
#46
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...
#48
5
Yes, no problems with mixing todays synthetics with even different viscosities
#50
^ 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
![Roll Eyes (Sarcastic)](https://www.6speedonline.com/forums/images/smilies/rolleyes.gif)
#51
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.
#52
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
![Roll Eyes (Sarcastic)](https://www.6speedonline.com/forums/images/smilies/rolleyes.gif)
wonder if i can dump that ( slowly, ..as its a 10 year supply lol ) in the 'ol '66 tr6sr
![Wink](https://www.6speedonline.com/forums/images/smilies/wink.gif)
#54
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.
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.
#55
Originally Posted by lightguy
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.
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.
#56
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
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
#58
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.
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.
#60
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.
Why would you use anything else if you wanted to run "Thicker" oil.
I even use it here during the harsh California winters.
![Smilie](https://www.6speedonline.com/forums/images/smilies/smile.gif)