recommended oil change interval for full synthetic? - Mustang Ecoboost Forum
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post #1 of 5 Old 08-03-2018, 07:57 PM Thread Starter
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recommended oil change interval for full synthetic?

I just switched to full synthetic oil this past oil change, and Ford seems to think I should change it every 5K to 7.5K, does that sound right?
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post #2 of 5 Old 08-04-2018, 06:22 AM
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Originally Posted by ecostang2015 View Post
I just switched to full synthetic oil this past oil change, and Ford seems to think I should change it every 5K to 7.5K, does that sound right?
Where are you getting the 5K to 7.5K number from, Ford Service Dept.? Unless you are driving the car very hard, or operating it in a very dirty/dusty environment. Let the cars IOLM (Intelligent Oil-Life Monitor) do what it was designed to do. Ford engineers have designed a system which continually monitors how you drive the car. It then uses those driving habits to determine when to change the oil & filter. These are the typical oil change intervals in your Mustang when utilizing the IOLM. This information comes right from Ford's website at: https://owner.ford.com/how-tos/vehic...e-monitor.html

  • Normal - 7,500 - 10,000 Miles
  • Severe - 5,000 - 7,499 Miles
  • Extreme - 3,000 - 4,999 Miles

So the service department must think you beat the crap out of your Mustang if they are recommended that interval!

My wife's Ecoboost sees both city & highway driving on a regular basis. She's got somewhat of a lead foot when it comes to accelerating away from stops. I wouldn't say she's hard on the car, but her driving habits are closer to the lower end of the "Normal" scale in the list above. Now I just changed the oil in her car last weekend. The last oil change was done in August of 2017. She put approximately 8400 miles on the car in 11 months time. The IOLM in the car was showing 8% oil life left. Personally I like to change it once it gets below 10% or annually, whichever comes first. While performing the oil/filter change I also took a sample of the used engine oil and sent it off to Blackstone Labs. I do this for both the Vette and the wife's Mustang. It's a good way to see how well the oil is doing its job and if there's a potential problem rearing its ugly head like a bearing going bad, coolant in the oil, metal shavings, etc.

I should have the new analysis for this latest oil change back any day now.

In case you're wondering I use Mobil 1 5W30



...and a Mobil 1 filter. (M1-102/M1-102A)



So bottom line is I recommend you let the car's IOLM tell you when to change the oil & filter. Unless wasting your money and changing the oil sooner than necessary makes you sleep better at night...

U.M.

2016 Ecoboost Mustang
2009 C6ZO6
2005 Mustang V6 (Sold)
2003 Terminator (Sold)
2002 Mustang GT (Sold)

Last edited by Uncle Meat; 08-04-2018 at 06:36 AM.
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post #3 of 5 Old 08-04-2018, 09:16 PM Thread Starter
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Quote:
Originally Posted by Uncle Meat View Post
Where are you getting the 5K to 7.5K number from, Ford Service Dept.? Unless you are driving the car very hard, or operating it in a very dirty/dusty environment. Let the cars IOLM (Intelligent Oil-Life Monitor) do what it was designed to do. Ford engineers have designed a system which continually monitors how you drive the car. It then uses those driving habits to determine when to change the oil & filter. These are the typical oil change intervals in your Mustang when utilizing the IOLM. This information comes right from Ford's website at: https://owner.ford.com/how-tos/vehic...e-monitor.html

  • Normal - 7,500 - 10,000 Miles
  • Severe - 5,000 - 7,499 Miles
  • Extreme - 3,000 - 4,999 Miles

So the service department must think you beat the crap out of your Mustang if they are recommended that interval!

My wife's Ecoboost sees both city & highway driving on a regular basis. She's got somewhat of a lead foot when it comes to accelerating away from stops. I wouldn't say she's hard on the car, but her driving habits are closer to the lower end of the "Normal" scale in the list above. Now I just changed the oil in her car last weekend. The last oil change was done in August of 2017. She put approximately 8400 miles on the car in 11 months time. The IOLM in the car was showing 8% oil life left. Personally I like to change it once it gets below 10% or annually, whichever comes first. While performing the oil/filter change I also took a sample of the used engine oil and sent it off to Blackstone Labs. I do this for both the Vette and the wife's Mustang. It's a good way to see how well the oil is doing its job and if there's a potential problem rearing its ugly head like a bearing going bad, coolant in the oil, metal shavings, etc.

I should have the new analysis for this latest oil change back any day now.

In case you're wondering I use Mobil 1 5W30



...and a Mobil 1 filter. (M1-102/M1-102A)



So bottom line is I recommend you let the car's IOLM tell you when to change the oil & filter. Unless wasting your money and changing the oil sooner than necessary makes you sleep better at night...

U.M.
I drive aggressive enough but lately I've been babying the car, trying to get a bit better fuel mileage. I just passed the 5K mark with my motorcraft full synthetic oil. Yes, Ford service department is recommending 5K-7.5K between changes even with full synthetic, which is something that baffles me, I've heard full synthetic going as far as 10K and higher
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post #4 of 5 Old 12-09-2018, 08:35 AM
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The cheapest maintenance you can do is an oil change, I use Amsoil Boosted full synthetic and change every 5k miles it's daily driver and sees some track time I have the Ford performance tune, 3" catless down pipe.

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post #5 of 5 Old 12-09-2018, 08:51 AM
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Originally Posted by dfrford View Post
The cheapest maintenance you can do is an oil change
While I agree with your statement, it no longer becomes cheap when you're using Amsoil. $10 a quart is pretty steep! Just a suggestion... but why not send a sample of your used oil to Blackstone Labs and have them run an analysis on it to include listing the TBN (Total Base Number) level remaining in your oil? The remaining amount of TBN will tell you how long you can run the oil before the additives are exhausted. It just doesn't make sense to change oil when the oil is still properly performing its job of lubricating the engine. It's like throwing away a bottle of Scotch when it's still half full and then buying a new bottle of the same brand to replace it.

U.M.

2016 Ecoboost Mustang
2009 C6ZO6
2005 Mustang V6 (Sold)
2003 Terminator (Sold)
2002 Mustang GT (Sold)
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