M1 EP - 15k / 2.5 years - any issues?

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A friend uses M1 5-30EP in his Ford with 15K OCIs, but he does it in 8-10 months. The engine now has about 185K and runs great. I believe, in your case, I would change oil every year.
 
Mark,
While I am normally not an advocate for an UOA, you fit the bill. Mobil EP is guaranteed for 15,000 miles or one year (whichever comes first). This doesn't mean that EP can't go over 15,000 miles or one year but when you extend an oil change interval beyond what is recommended and then you need to err on the side of caution and do an UOA. I think there is a good chance you can go two years but I have serious doubts that you could reach three.
 
Originally Posted By: gfh77665
I would use with confidence and not change. It is designed to last.

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Originally Posted By: AVB
...the M1EP warranty is only good for 12 months.

I've always found it odd that the vast majority of all warranties are for precisely one year? It begs the question: what's so magical about 1 year/12 months/365 or 366 days? Over time, it really does help get the masses thinking irrationally (myself included). What incremental additional risk exists on day 370 that didn't exist on day 365? What incremental additional risk exists on day 400 that didn't exist on day 365?
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Originally Posted By: Cristobal
...take the car at least now and then on a trip of 40 or so miles so the oil can heat up and eveporate any water in it.

Isn't that unnecessarily long?
 
I ran it out to 10540 miles, and changed it earlier this afternoon.

Sent the UOA bottle to Blackstone today as well; I'll post the UOA when I get it back and put a link on the thread.
 
Oh, and it turns out I had a Motorcraft FL-400s instead of a FRAM Extended Guard. I'm really curious to see how the UOA comes out as a result.
 
If Mobil says 15K or 1 year, I would lean toward their recommendation. 2.5 seems excessive. I have no data to support this.
 
Originally Posted By: mark pruett
Apparently 2.5 years and a Motorcraft FL-400S don't make any significant difference. My UOA came back fine.

Link to UOA post


After looking at your UOA I would agree.
 
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