Join Date: Feb 2018
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
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...
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