Post a pic of your car as it sits currently

[sleepyalero]

isnt 5w for winter?

[bricooper78]

not nowdays, 5w30 is what your car should have in it. it's factory spec.

the 5.4 in de earld ferd is 5.30 and can do 5w20, that's whats in it now, 16 year old truck, ford says it's ok... idk. the kia is 5/20 also. all factory specs

[TDavis]

Originally Posted by Metallman56

TD where did you buy the borla and how much did you pay if you dont mind me asking

Bought it from pfyc for $756 shipped. Got here in a little over half a day

[sleepyalero]

from my understanding you usually run 5w for colder weather cause it flows better, 10w in summer

[[ChaosweaveR]]

Originally Posted by sleepyalero

isnt 5w for winter?

Nope. Modern oil is multi-viscosity. Basically, 5W-20 is 5 when it's cold and 20 when warmed up, in the utmost of a basic explanation.

Don't tell me you use 10W-30 in yours... -__-

[kzulfic]

Na, he use 15w40.

Because diesel.

[bricooper78]

@Kam

with the valleys in the engine, you really don't want to run a too thick number on the startup viscosity, so your cap says 5, or your book says 5, unless over 100* ambient temps and then it says 10- is okay, then run that. the old days of switching back and forth are long gone.

the tolerances are so tight, you don't have to run the thicker oil in the summer to gap fill to make up for leakage/burnoff, and you can do more harm than good running oil that is too thick.

but for no more than yours is run, your oil probably is like jelly anyways bub

[[ChaosweaveR]]

Bingo. I laugh at people throwing 10W-40, 15W-40 and 20W-50 in modern engines. I mean, how stupid are you?

[kzulfic]

Originally Posted by [ChaosweaveR]

Bingo. I laugh at people throwing 10W-40, 15W-40 and 20W-50 in modern engines. I mean, how stupid are you?

Modern diesel engines use 15-w40.

[sleepyalero]

well i must certainly say.....

[bricooper78]

I was thinking about doing a 10/30 trial for the summer, due to the truck burning a little of this 5/20, but then realized that it isn't going to do me any good, and 5/30 will be fine. Ford released some bulletin about using the 5/20 for better fuel mileage, (but then the motors started using some oil with the lighter oil in it, imagine that) and for no more fuel than it's saved me, if it's gonna burn it, I'll just switch back and lose that .001% I gained on lighter oil

[sleepyalero]

ive used 5 but is it really technically bad to run 10w-30 in summer weather?

[bricooper78]

that is your "cold thickness"

as I was told, at cold startup, there is a 5 second difference to bottom to top of the motor, but I don't remember specific temp range and all that, so it isn't so much going to blow up your motor, but your motor was designed for 5w on startup in most temp ranges, so that's what we're supposed to use.

absolute worst case, you could starve the top half of the engine from oil, and you know what that would do. it's just not necessary to flip flop anymore, the engines have developed, and the oil has developed to the point that it's not necessary

[sleepyalero]

thanks for that.

[bricooper78]

Ya man, I'm in Iowa, so it's literally anywhere from -10 to 120 here, before windchill or heat index, so it takes all kinds, and I just run the manufacturer's recommendations in everything, and have never had a problem, back in high school, my buddy's old 79 chevy, the ol' tree-fiddy, it went back and forth, but it was 10/30 winter and 10/40 summer. so it just stayed a little thicker when it was warm out... but that's 1979 engine.


I'm waiting for Aaron to come in and blow apart everything I know about oil any second

[1995quad4se]

Run 5w30 year round with -40* up to about 105*. However i'm burning about a quart by 3k so maybe some 10w30 or 5w40 (do they make that) would help?????

[sleepyalero]

hahaha yeah he might pop in!

[bricooper78]

The first number is cold weight.

So 5 is sort of how fast the cold oil can start circulating the system.

the last number is hot weight... so the thicker it is, the more heat it can transfer and the better it can protect...basically.

however, that oil has to go through little galleys in the engine, and it is designed (for the 3.4) for 5w30, so it will support 30 as the last number when it's warm.

in THEORY you could run 30w in it, straight weight, there is room in the engine for it to flow WHEN ITS WARM, so if you kept the engine at 180* or up (near operating temp), it would be fine.

So the 0-30 vs 5-30 vs 10-30 is all cold temp difference, or how well the oil flows at cold temps. Remember, Mike Jung runs Mobil1 0-30 due to the extreme cold up in the great white north, so when it's really cold, the oil gets up and lubricates quickly, and as it warms, it thickens, and is 30 weight.

If you wanted warm weather protection, you'd want 5-40, so at startup the oil gets to where it needs to be, and then it runs thicker once warm, at a 40 weight rather than 30, which our engine is NOT designed to flow, it can burn up the sending unit, pump, seals, gaskets, not flow correctly through the internal galleys and you can lose a motor over it. it's pretty unlikely, but running the wrong weight is bad.

[EnragedDolphGT]

Just added wheels

[[ChaosweaveR]]

Dat noob post, tho.