Originally Posted By: scudpilot
sissix, you will get many opinions on whether you should dump the FF now or go by the OLM. The only reason I dump mine early on the FF(factory fill) is that every single oil analysis I've seen for a new engine it has higher metal content due to the engine breaking in. Will this increase the wear on the engine long term? I don't know. Probably not. My wife has a 2011 MKX with your motor and I run MC 5W20 and an FL500S and change it every 7500 miles and would definately go 10,000 miles, but since I rotate the tires at 7500 I just change the oil too.
It always has seemed to me with Ford engines, when they start to burn a little oil during a oil change cycle, it is probably time to change it out. At 7500 miles my wifes engine still has burned no oil so I do believe Ford's claim of 10,000/1yr.
Some will argue that you need synthetic oil to go 10,000 mile change intervals, but I think this 3.7 can with MC semi-syn. especially with your high highway miles!
Pete
I may change it at 7500, I'm almost there now. OLM at 33%. The motorcraft is just very easy to get and priced right. I've used it in all my ford's with no problem. My wife has a '10 Flex and I was using the motorcraft but recently switched to PP. Her job is 2 miles away from the house with no traffic and I change it at 5k. I just figured the full synthetic would be better for the short trips.
One good thing is both cars use the same filter so I order those in bulk.
