Which oil do you use ?

[JTR]

Motorcraft Synthetic Blend 5W-20.

This. As recommended by the manufacturer.

+1

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[Millgeo5]

Mobil 1 has always been good to my cars.

 

[fiveohalex]

Rotella 15w50

 

[Renner]

Mobil 1 has always been good to my cars.

+1 for Mobile one...great that Walmart sells it cheap also

 

[snkmug]

it does not matter if you are dumping it every three thousand miles. Even the walmart brand is fine. Now if your running it 7-8K miles, then get the full synthetic stuff. I live at the beach in NC and always run the 5w-30 in the summer and 5w-20 in the winter. The 5w-20 is too thin when its extremely hot outside.

 

[89Trooper]

I still think it's funny that people think the "w" means "weight".

 

[superdave592]

it does not matter if you are dumping it every three thousand miles. Even the walmart brand is fine. Now if your running it 7-8K miles, then get the full synthetic stuff. I live at the beach in NC and always run the 5w-30 in the summer and 5w-20 in the winter. The 5w-20 is too thin when its extremely hot outside.

I am with you might mix 5w-20 5w-30 same brand winter and 10w30 summer 5w-20 scares the crap out of me

 

[JTR]

I still think it's funny that people think the "w" means "weight".

:lol:

 

[snkmug]

20 or 30 is the weight, I stopped using 5w-20 in the hot summer when my motor would start making noises. It's just too thin for hot climates

 

[JM7225]

In my opinion you don't need to change oil for the season. Modern oil is made to get thicker as the temperature of the oil goes up. The first number you see is what the oil viscosity is when it's cold (to a certain degree) and the second number you see is the viscosity of the oil when it's at operating temperature, up to 100 C I believe. So if you go from 5W-20 in the winter to 5W-30 in the summer, your oil is actually probably thicker on 'cold starts' because the ambient temperature is hotter outside. It might actually go more harm than good.

According to the owners manual for the Coyote engine (minus the boss engine I think) the recommended oil is 5W-20, so that's what I would use all year long.

 

[89Trooper]

20 or 30 is the weight

I was just referring to how the "w" actually stands for "winter", and not "weight", as many people believe.

5w-20 =

At normal operating temperature, the viscosity is 20 (thicker).

At 0 degrees (simulating winter), the viscosity of the oil is 5 (thinner).

I'm in Florida, and will be using the recommended Motorcraft Synethic Blend 5w-20 all year round, with a Motorcraft filter.

 

[dubster99]

I always ran royal purple in my WRX.

 

[Laztug]

Whoa, no way. Castrol GTX conventional oil. Only the best for me; I want all-natural oil, none of that crappy fake synthetic garbage.

 

[10splaya22]

In my opinion you don't need to change oil for the season. Modern oil is made to get thicker as the temperature of the oil goes up. The first number you see is what the oil viscosity is when it's cold (to a certain degree) and the second number you see is the viscosity of the oil when it's at operating temperature, up to 100 C I believe. So if you go from 5W-20 in the winter to 5W-30 in the summer, your oil is actually probably thicker on 'cold starts' because the ambient temperature is hotter outside. It might actually go more harm than good.

According to the owners manual for the Coyote engine (minus the boss engine I think) the recommended oil is 5W-20, so that's what I would use all year long.

The bolded part is the only thing you said thats correct. Oil doesn't get thicker as it warms up. That doesn't make sense. The first number in a 5W-30 oil is the "winter weight". So it will perform like a 5 viscosity oil at the cold temperature. The 30 number is the oil at 100 deg C. So it behaves like a SAE viscosity of 30 when warm. Yes a 5 viscosity is thinner than a 30 at the same temp but you have to remember that the 5 viscosity is the rating when cold. So at 0 deg C a 5 viscosity oil will still be thicker than a 30 viscosity oil at operating temp but the 5 viscosity oil will be much thinner than a 30 viscosity oil at 0 deg C.

Here is a chart for an example:

 

[DavisCustoms]

Mobil 1 5w20 Full Syn in the Steeda
Castrol GTX 20w50 in my 2 older 5.0's (one has 250,000 miles and still going...)

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