engine oil viscosities - what do you use?

[I-nearly-bought-a-batty]

Ok guys - what oil weight do you use? The manual states 10-30W. I'm currently using 10-60 Castrol formula R (Now called EDGE). I'm wondering whether I should switch to a grade closer to the manufacturer's spec. What do you think?

 

[Nicely]

Most of the UK lot usually go for 5 or 10W50, but that in a colder climate.

 

[A'PEXi]

10w40

 

[S15R]

in nz i use 10W-40 which is what soichi recommends .

 

[robf]

oilio

Fuchs 10/30 synth

 

[I-nearly-bought-a-batty]

a lot of guys in nz use 10-30W. I wonder what Nismo recommend for track Silvia's?

 

[Derek]

15w50