What oil to use for speed3

[assman]

Ok its been discussed to death but i wanted some input.

I know some manuals say 5w20 some say 5w30

Heres what i want to do. Run Mobile 1 synth 10w30 summer and 5w30 winter becuase its less thick.

Does this sound good?

 

[Betelgeuse]

The more recent edition of the manual says 5w 30. 5w 20 shouldn't hurt it but it's probably best to stick with what they recommend.

Personally I would stick to the recommended weight even when using synthetic. If you look at the properties of mobil 1 5w 30, you'll see that it's designed to work well in both extremes, hot or cold.

http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_5W-30.asp

 

[APEXistud]

Since you're in Canada 5w30 in the winter will be fine. But in the summer you may want to consider 10w40 might be better depending on how hard of a driver you are. A lot of WRX and EVO guys run 10w40. Hell I usa it Royal Purple 10w40 on my Miata. It significantly reduce HLA (valve chatter) on the Miata.