winter motor oil

[Steve Tinker]

Porsche recommended oil viscosity grade 5W40 for use in Scandinavia and Russia. I'm sure their winter temperatures would make a New England winter feel positively balmy......
A lot of people seem to be using Castrol Syntec - I use Shell Helix Ultra but I don't know if you can get that oil your side of the pond.

[jacabean]

my owners manual says for synthetic below 50F use 10w-40 , 10w-30 or 5w-30 but after searching around this forum it seems like no uses those blends . the one thing i do know is that it will be Castrol syntec.

[jacabean]

ohh yeah and it does get that cold here !

[mikefocke]

Comments and link to a recent list from Porsche

[Idaho Red Rocket 3]

I have a '98 with 127k miles on it. It is running realy well. I have some questions for the forum.

I use M-1 10-30. My son is telling me to use 10-40.
Does 10-30 / 10-40 realy matter ? Which is best ? Is there something better ?

I've noticed many manufacutures going away from M-1 and now endorcing Castrol.
Why ?

Since it is a '98, I have considered using my motocycle oil since that has older style ratings.
Any thoughts ?

[JFP in PA]

Yes, the XW-40 weight does matter; XW-30 is too thin for the M96 engine once it is warmed up. Considering your location, something like Castrol Syntec 5W-40 would be a good choice..........

The reason Mobil 1 has fallen from grace is that it has been reformulated into a poor performing shadow of what it once was.

[jacabean]

would 10w-30 be ok for winter usage ?