Well to put it quickly early 12 bosses and 13 track pack gts show 8.5 quarts but the latter have is eight listed that includeds bosses guys. wtf I have called my plant manger and warranty rep plus ford customer service and my local ford to no avail this needs to get out wtf is going on ford

 

Early 13 manual photocopy http://www.allfordmustangs.com/forum...1_15_17_16.pdf

 

The extra 1/2 qt is for the oil cooler, so maybe for changes not all of the oil is draining out and 8-1/2 qts ends up being too much at change time.

 

My plant manger had a good idea and that was that ford lowered it for the idea that some owners might over fill because it's is kinda hard to get 8.5 quarts to the teeth and ur theory may be right lucky I had my oil changes at ford dealerships and glad I did now

 

Overfilling is usually a lot worse than running a tad low.

 

Why do you say that? I'm not sure I agree.

The Mustang dipstick doesn't have an overfill warning. If anything, I'd rather be a 1/4 quart too high than a 1/4 quart too low. Also my last HPDE instructor (BMW racing school) told me he has always overfilled the oil in all his cars over the years, and I'd tend to agree with him.

 

Over-filling can lead to excess windage, crank whipping up the oil, lowers HP and makes froth in the oil.

 

Some of our fellow Mustang owners have no clue. TOO MUCH OIL IS NOT GOOD.

 

No clue?! I beg to differ. If you overfill by a full QUART, yeah, that's not good. But if you overfill a 1/4th or less? I think not. My other car has 126k on it, and my wife's has 80k. I've overfilled each (not by much, but still) on every oil change. No problems at all on either, and I don't have to worry about either car burning a little here or there between the 7500 mile changes. Between that, and racing instructor's opinion, I rest my case.

 

Overfilling is very bad. Slapping a crank into overfilled oil will bend and destroy parts.

You've been lucky overfilling, lucky period.

 

I think we all agree overfilling is bad. But the question boils down to Quantities. In other word overfilling by HOW MUCH. Assuming 8qt is the target. 9qt is bad. Is Filling to 8.2qt very bad? How about 8.1? How about 8.01qt. Get my drift?

I know at this point it's becoming an epistemological question, but let's get real. I'm an engineer, and I have a tendency to deal in absolutes, so please humor me. Statistically I can only get "lucky" so many times in a row.

 

Adding Engine Oil
Note: Do not remove the filler cap when the engine is running.
Note: Do not add engine oil further than the MAX mark. Oil levels above
the MAX mark may cause engine damage


I feel really bad now I never got to blow the horn and you guys get those really cool hats. Lol

 

Oh, so it's binary in your mind? Just under the fill line is all good but just over is the end of the word? Glad you didn't design this engine, because you must not be familiar with a term "tolerance stack up" I mean let's be honest. They have to draw the line on the dipstick somewhere. And then there is tolerance on top of that. It's the same reason your Low Fuel light turns on well BEFORE you run out of fuel, not AS you run out of fuel.

My manual says:

1. Remove the filler cap.
2. Add engine oil that meets Ford specifications. See Capacities and
Specifications for more information.
3. Replace the filler cap. Turn it until you feel a strong resistance.

I was just thinking about my "overfilling" statistics. 126k on my car + 80k on my wife's that = 206k miles. Oil change with "overfilling" every 7.5k = 27.46 oil changes that were "lucky". Of which I got "lucky" 27.46 times. I wish i could take these odds to Vegas baby!

 

You can stop trying to sell it because nobody's buying it.

 

Good point. Hardly anyone buys truth these days

I guess I just like to argue

 

I'm with you. A little over won't hurt.

 

You're probably right but why overfill when the car already has a tolerance of 1/2 to 3/4 of a quart?

 

All I can say is once you get past the tolerances for overfilling the crank causes frothy oil and instead of pumping oil through it pumps oil with air bubbles through causing premature bearing wear.
Where the line is for being overfull I have not a clue, but I am pretty sure a 1/4 of a quart will not hurt. But unless you have a car that uses oil or are running at a constant High RPM why overfill?

 

I buy my oil at wal mart comes in 5 gal containers of Mobil 1. So i fill the oil filter first then put the rest in the oil fill. Open the next container and have to watch that I only put 3qts in maybe a little over. Cannot see this being a problem

 

Exactly what I do, but I put a little less than 3 out of the 2nd container, since you're never going to completely empty out the oil pan.