winter motor oil

[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 ?

[JFP in PA]

Originally Posted by jacabean

would 10w-30 be ok for winter usage ?

No; the M96 needs 40 weight on the high side, summer or winter...........30 weight on the high side is not enough.

Look for Castrol Syntec 5W-40 or 10W-40 (my preference).............

[mikefocke]

Engine Oil Recommendation in my 986 owner's manual yesterday.

I was amazed to see that 10W30 is actually listed in colder (Below 50F/10C) environments. And then contradicted in bold with a "10W40" or higher statement.

I wouldn't and don't use ..W30 but I wanted to interject this little bit of Porsche's contradictory view into the discussion.

You ought to see the viscosity Honda recommends/uses!

[jacabean]

Now that i spent a little time trying to get a better understanding of what the oil numbers really mean , i guess that 5w-40 would be the oil to use year round . the thin 5w for cold start and the thick 40 for normal operating temps. the only thing i question is in january the temps here can stay down below freezing for some time. In those temps does the oil really make it to the "normal" operating temp ?