LEJAY

30 is a thicker oil (viscosity), 20 is a fairly hew "multigrade" to increase fuel mileage.
I gotta eat dinner, but, I'll be back to discuss Later !!!!!

Skrappy

You will see that 5w-20 is in most new Honda, Toyota, and Mercedes cars as well. It will be the new standard for most cars soon.

Skrappy

06GT4RAD

The ONLY reason all these manufactures have gone to 5w20 is to meet CAFE standards for fuel economy. It helps all there cars and trucks get better gas mileage which then allows them to meet the standards that have been set. The reasons behind this is with the large trucks and SUV's getting such bad mileage that if they can increase the cars along with the trucks/suvs they can then meet the standards set by CAFE.

O an i persoanlly will not run 5w20 it is a little to thin for me. I will run Mobil 1 5w30

Richard

Firststang05

we live in kansas city missouri. this is my first ford product and had seen 5 20 and thought WTF. then i did some checking and found that it was because of the OHC, and smaller oil gallies. Any brand that comes to mind that is better than another. I wont use castrol but had good luck with mobil 1 and thought about amsoil.

LEJAY

I'm for a 5W30, I like the idea of a little higher viscosity. Definitely a synthetic, for sure.
The best brand on the planet, I've found is LUBRICATION ENGINEERS MONOLEC SPB 8530

W1ldcat

I would think for Mustangs that Castrol would be best. John Force uses it

LEJAY

You really think so ? Castrol is on the outside, not the inside.

undefeated

Most that I know recommend Mobil 1 Synthetic.

06GT4RAD

Mobil 1 for me

Richard

LEJAY

Sure Richard, SUPPORT those theives that are nailing you at the gas pump. Do you know they made a $51 billion profit in the 1st qtr ? Give 'em more of your $$$$$$$$$