GidyupGo

Why run 30W in our cars? Doesn't the 20* in temp difference go away with the cooling fan? Isn't that why we have stats so the operating temp stays the same? I may run 0W20 next winter for better warm up mpg's but I'd never go 30W.

05 Mustang

I run Mobil 1 Synthetic5w-30..

where in Georgia are you located, I am up 575 in Canton Georgia, North of Woodstock, Georgia..

[IMG]local://upfiles/50057/E747F6708495464B8B94C787BCA199FE.jpg[/IMG]

[IMG]local://upfiles/50057/FD24EDEC088348489EC85F196371DC1F.jpg[/IMG]

Nuke

As if being in the south is really that much hotter than the north... In PA we get up to 100 for a few days every summer. And here in KY we had 6 days in a rowabove 103 last summer.Your engines don't get much hotter, if at all, in the south compared to the north. I just think "y'all" in the south just have a need to feel "special". LOL!

Ford_Dude

your engine is much hotter than the outside temp anyway
so unless your seeing 150F+ outside its not going to do anything to you

now if you were seeing -40F or lower then worry about 0W-20 instead
and if your seeing 150F+ then get 5W-30

it doesn't get near that in the continental US so don't worry

drbobvs

+1, I do too, but I have no problem with running 0w20, 5w20, or 0w30 either. 5w30 is just what I'm comfortable with and I believe it has slightly better viscosity for the summer heat as well as those 1/4 mile runs.

mjm2007

I work with a bunch of Ford guys(Guys who work for a company in Michigan that do alot testing and prototype work for Ford)and asked the same question to them, was told that it isdue to the tighter tollerances of the main bearings the ford recomend the 5w20. Thicker oils due not get into the bearings well enough to keep the lubed. One tech said he has seen quite a few with wiped bearings and they all used heavier than recomended oils!!

mjm2007

I work with a bunch of Ford guys(Guys who work for a company in Michigan that do alot testing and prototype work for Ford)and asked the same question to them, was told that it isdue to the tighter tollerances of the main bearings the ford recomend the 5w20. Thicker oils due not get into the bearings well enough to keep the lubed. One tech said he has seen quite a few with wiped bearings and they all used heavier than recomended oils!!

drbobvs

Yes, and this is to ensure proper lube at start up and when cold, and 5w30 is still 5 in both those circumstances. I will put a full synthetic 5w30 up against a 5w20 synthetic blend that recommends any day, at any temperature, under any conditions in our 3V engines.

FINGT

Good topic.
In Finland it seems to be impossible to find 5w-20 oil, we just don't have enough cars using that to create market for it.
So, seems that I need to use 5w-30 that is available from Mobil and Castrol.
[/align]

fosman77

I run Castrol Syntec 5-20 year round and we get many days well into the 90s