Originally Posted by
rugsr
i use mobil 1 oil filter
drop im MPG...is this due to thicker oil. it puts more strain on the motor?
why doesnt everyone just go with 10w to be safe...why bother with 5w
I'm no engineer... but the primary benefit with 10w30 over 5w30 is that 10w30 will flow better at subfreezing temperatures.
I assume that increase in low-temperature flow performance comes at the detriment of overall viscosity and therefore, slightly increased drag / fuel consumption.
Keep in mind we're talking about very slim margins here.
It's not like 5w30 is water and 10w30 is like cement.
And to answer your broad question, I use 5w30 because I never see the subfreezing temperatures where 10w30 provides additional protection.
Also, this isn't new news. The Owner's Manual and HELMS Factory Service Manual both discuss the use of 10w30 in cold climates. :shrug: