76 super synthetic blend,5w30 or 10w30?

[Carguy80]

which one should i use at temperatures,+20f to + 80f.(-7c. to +27c.) oil is 76 super synthetic blend, and my firebird v6 has 112500 miles on it.which one will be better and would provide better protection,5w30 or 10w30?

 

[csandste]

I think all of the Conoco-Phillips oils are top rate. Doesn't your engine call for 5w30?

 

[tensecondz1]

Cant go wrong with either,,, almost identical,, and both flow well at cold temps.

 

[Carguy80]

yes it does,5w30 preferred,but 10w30 can be used if its going to be 0f (-18c.)or above,says my owners manual.im just worried a bit over 5w30 that it shears down quicker than 10w30.and as far as i now,10w30 in summer should be better to use than 5w30,right?

 

[tensecondz1]

If it makes you feel better run the 10W30

Some members here such a Molakule have stated that newer VI improvers dont have the shearing problem as oils in the past.

Flip a coin, either will work fine.