2005 Mustang GT & synthetic Oil

upstate said:

I want to run my Mustang GT until about 500 miles and then change the oil. I woulkd like to go to synthetic oil. Some have said wait till 1,000 miles till you go to synthetic oil. I don't understand this because the Corvette and Cobra R come from the factory with synthetic oil. Thus during the first miles. What do you think?
Second question if I go to synthetic oil and I go with Mobil 1 is 5w-30 OK or should I find 0W-20? Let me know your thoughts. Thanks.

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MadFish said:

I know all European cars come from the factory with full synthetic oil.

Im going to put synthetic oil in my car after(when) I get my car.

I ran 0w-30 in my BMW, as do most European cars. If you go to the parts store and look. Mobile 1 labels the thier oil. 0w-30 says European car formula. And the rest all say what they are formulated for.

Look at Wal-mart for Mobile 1 oil. Its cheaper there. I could buy 7 quarts of oil ofr my car for like $30. And most parts stores wanted close to $40.

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TomServo92 said:

The Walmarts in my area don't carry Mobil 1 0W20. I wish they did for the reasons you state. They do carry 0W30 but that isn't the equivalent of 5W20.

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MadFish said:

Thats weird. The wal-marts near me all sell 5w-20. Sometimes they have 0w-30. Most of the time I have to ask for it and they have to order some in for me.

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upstate said:

I want to run my Mustang GT until about 500 miles and then change the oil. I woulkd like to go to synthetic oil. Some have said wait till 1,000 miles till you go to synthetic oil. I don't understand this because the Corvette and Cobra R come from the factory with synthetic oil. Thus during the first miles. What do you think?
Second question if I go to synthetic oil and I go with Mobil 1 is 5w-30 OK or should I find 0W-20? Let me know your thoughts. Thanks.

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romans8:28 said:

Found a quote from your owners manual that applies:

From the 2005 Mustang Owner's manual:


BREAKING-IN YOUR VEHICLE
Do not add friction modifier compounds or special break-in oils during
the first few thousand miles (kilometers) of operation, since these
additives may prevent piston ring seating. See Engine oil in the
Maintenance and Specifications chapter for more information on oil
usage.

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Paul Pysher said:

So your are saying mobil 1 oil is better than castrol or vavoline sytecs

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TomServo92 said:

I believe they are referring to things like Slick 50, not synthetic oils like Mobil 1. The section mentioned above that refers to oil usage states to only use an oil that meets a certain Ford spec (which Mobil 1 0w20 does).

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romans8:28 said:

I respectfully disagree..... synthetic oil is itself a friction modifier (by default) but in either case pay attention to the "why" in Fords statement (piston ring seating), then consider what Mobil one prevents the engine from doing.

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TomServo92 said:

And I respectfully disagree with you. If they didn't want you to use synthetic for the first 1000 miles, they'd say so. That's why there is are two separate sections in owners manual: one for friction modifiers and one for motor oil. Friction modifiers are things like teflon whereas Mobil 1 contains no teflon. It's just exceptionally good motor oil.

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romans8:28 said:

Intresting, but I still disagree (not about waht the manual is saying) about using it to soon.

Mobil one (look at a bottle) advertises "Supersyn Antiwear Technology"

The oil includes "antiwear" modifiers specifically designed to prevent engine component wear. Once again I refer you to what the Ford owners manual states about proper engine break in/ring seating. I am suggesting that for the same reason you would not want to use a "slick 50", you would not want to use a synthetic motor oil to soon. After a couple thousand mile I wouldnt run anything else. I love mobil one personally and use it in everything.

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max2000jp said:

Cars come straight from the factory with synthetic. AMG, BMW M, Porsche, and GM's Corvette come factory filled with Mobil 1. I feel that it's fine to put Mobil 1 or comparable synthetics in at low mileage. If the rings didn't seat properly, do you think the companies listed above would use it as factory fill? I will be putting M1 in my Mustang at 500 miles or 3000.

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romans8:28 said:

Just because other makers may use it as factory fill means nothing to your FORD, and just because it meets the Ford spec for oil does not mean it does not have additives that ADVERSELY affect the ring seating procedure.

Why don't you call your Ford service advisor or customer hotline since you refuse to trust my recommendation, and see what they say about "synthetics" during the break in period.

you can lead a horse to water............

BTW,
Exactly why are you determined to use the Mobil One at 500 miles, what are you hoping to accomplish by doing so? I use it to preclude engine wear, of course my rings are properly seated because my engine is fully broken in (which Ford does not do during manufacture, unlike your synthetic fill auto makers)

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