oil weight

[fantasyfords]

ok guys quick question, what weight and what brand oil do you run in your 5.0? I think im running to light a weight, im running 5w30 castrol syntec. I live in nc and the temp's in the winter are in the 20's to 30's and we have average summers. Should i be running 10w30 or 10w40 instead of 5w30. thanks for the info

[stang_racer20]

it wont really make a big difference at all. For instance, I work at a Ford dealership by me and all we use are 5w-30 and 5w-20 for gas motors all year round. And thats what ford recommends.

[HiFlow5 0]

I use 10W40 conventional oil. Either Valvoline or Castrol.

[SkylineUSA]

I will say this, there are only 3 true synthetic oils. All the others are not. Redline, Amsoil, and Royal Purple.

Winter I run 5-30, summer 10-40 Amsoil.

[351wStang]

I;ve always run Castrol GTX 10w-30

[Tony H]

I'm from NC too. I use Havoline 10W-30 in all but my largest displacement engines.

I thought Mobil was full synthetic?

[SkylineUSA]

Originally Posted by Tony H

I thought Mobil was full synthetic?

Nope, they use to be.

[StangNut86]

ya know, it has this stuff in your owner's manual. or, it should. if ya don't have one, you can grab one at a dealer. prolly don't even have to buy one, just leaf through it, find your oil weight, and tell them you changed your mind =)

or even easier, just search on the internet =P

[rerun]

since when were owner manuals right?

[MagicRat]

Mileage and wear is a factor too. If your engine has lots of miles on it, like over 100k, a slightly heavier oil, such as 10W40 may be better than a 5W 20 or 30 oil.