Quote:
Originally posted by Azal Khan:
What are the proper viscosities? I heward that 10w40 can be used in all climates...What should I use when the avg. temp is 20 degrees in the winter season?....I have been using 10w30 all season....is that bad?
Quoted from The 2001 Nissan Xterra Owners manual page 10-7:

"SAE 5W-30 viscosity oil is preferred for all temperatures. SAE 10W-30, SAE 10W-40 viscosity oils may be used if the ambient temperature is above 0 F (-18 C).
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