Join Date: Sep 2012
Location: St. Louis, MO
Drives: 2008 Mercury Sable Premier
Rep Power: 92
Oil recommendation for my '03 SES
Unless it's Mobil 1 HM 5W30, specially designed for older cars.
Even then it can still sprout small leaks. It's still going to clean the deposits off and find holes, even if it does have gasket swelling additives you still run the risk of a leak starting.
I used valvoline full synthetic 5w-20 for a few changes and a bad oil leak started. I switched to Mobil 1 high milage 5w-30 and the leak has slowed down considerably.
So bottom line is I don't reccomend full synthetic for the first time on a car with anything over 75k, but if you still want to do it go Mobil 1 HM 5w-30. NOT 5w-20 or any other full synthetic oil.
Now motorcraft filters are what I would use. Just change by 5000 miles. If you end up going full synthetic for whatever reason, you can use a Bosch distance plus filter which is good up to 10,000 miles if using a full synthetic oil that will last that long. Wouldn't reccomend doing it in your car though.
+1 on the transmission though. Fluid and filter change every 30,000 miles. No more! Mercon V ATF
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2008 Mercury Sable Premier
2014 Ford Focus Electric
1997 Mercury Grand Marquis GS
Moved On: 2000 Sable LS Premium Duratec
Last edited by Sam; 02-25-2013 at 04:58 PM.