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Anyone using Mobil1 5w50?

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Hello to everyone from the crazy Italy,

few days ago, I talked with my POC in order to book a minor service.

As I use my Carrera especially during spring and summer with continuous heavy use, lots of acceleration with low average speeds in an extremely hot climate.

For this reason, my idea is to change the stock M1 0w40 with the M1 5w50 .

The boss of POC, told me that the engine runs best with the 0w40 because the 5w50 gives problem to VarioCamPlus system, increases fuel consumption and reduce engine power.

As mechanical engineer, I can be in agreement with him but, in the other hand, my experience and also other authoritative sources, suggest to use the best 5w50.

What do you think about?

Most important, anyone using the 5w50 on his 997? With wich results?


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Here is the response from Redline that I received asking for a summer driven (winter stored) 997.1:

Thank you for contacting Red Line Oil, in your 997 the first choice for use during the summer would be the 10W40, providing the best sheer stability of those three (edit: 0W-40, 5W-40 and 10W-40), significant moly levels a good all around choice for your driving conditions.

At your moderate start up temperatures there wouldn’t be a need or a benefit to the 0W40 or the 5W40.

In addition to the above:

Q: Would you also confirm that 10W40 is the only oil in this group without VII’s?

A: The 10W40 is the product of the three that doesn’t contain any VI improvers.

Q: Is 0W40 more to conform to Euro specs, such as low (or reduced) SAPS, Zn and Ph?

A: The 0W40 is not a low SAPS oil.

Theoretical additive levels:

Oil ...Zinc ...Phosphorus ...Sulf.Ash ...Moly

0W40 ....1330 ....1200 ....1% ....950

5W40 ....1323 ....1175 ....1% ....100

10W40 ....1330 ....1200 ....1% ....950

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I concur with most here that 0-40 is better if you live in lower temperatures (i.e. thinner consistency until warmed up). In real terms you are not going to do any damage with either as the tolerances are such that unless you live in extreme minus temperatures either will work. There seems to be a consensus that if you have RMS weeping that the 5-50 is slightly thicker when cold and may not seep as much !

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