5W-30 VS.10W-30

[CATERHAM]

Originally Posted By: HTSS_TR
Originally Posted By: CATERHAM

But the problem I'm facing is my S2000 spec'd only 10W30 for warmer climate (and 5W40 for colder area), since the car is rev'ed to 7-8k daily(after 10-15 minutes drive) and fairly high RPM on highway (4k-5k), I'm reluctant to use dino 5W30.

But, if I use syn oil in it then I may mix 3 quarts M1 AFE 0W20 with 2 quarts 0W40 to get a thin 0W30.

I certainly wouldn't use a dino anything, although that's what was originally spec'd for the S2000.
A premium synthetic 5W-30 or your 0W-30 blend would be good.
If the car has an oil pressure gauge that makes settling on the optimum viscosity a piece of cake.

 

[Redpatches]

For what it's worth I use a 5W-30 as my "Winter" oil (Mobil 1 or PP) and switch over to 10W-30 for Spring-Summer. Probably makes little difference living here in NJ where winters are "warm" and summers "cool", but whatever. My wife's 2004 Volvo V70 2.5 Turbo is spec'd to change to 10W-30 in summer whereas my 2008 Toyota Sienna XLE is spec'd to run 5W-30 but can run on 10W-30 if necessary. I just think running a good quality oil more important than whether I am running a 5 or 10. In the end it's all good.