I have a 2009 mercury grand marquis w/ flex-fuel 4.6l. I just changed the oil last month (and about 3000 miles ago) with magnatec 5w20. However, E85 done went and got all cheap (now down to $1.47/gal), so I've been running it lately. I'm due to hit 5000 miles on the oil by mid-january and don't want to push it any further than that with e85 use, so I'm thinking of changing the oil early (don't feel like laying in snow or paying someone else to do it). I've got plenty of free/cheap/paid-to-buy oil on hand, so cost isnt an issue.
Here's my oil stash options on hand:
5Qts of PUP 5w20
5qts of M1 5w20
(both of these will have one bottle of QSUD 0w20 added (6qt sump))
6qts of Meijer Autoquest (Warren) synthetic 5w20
QSAD conventional 5w30 (I have a 6 gallon ecobox of this)
Filters on hand:
M1 EP M1-210A
Motorcraft FL-820S
I spent about 20 minutes last night trying to eenie-meenie-miny-mo it, but just can't decide.
FWIW, I'm done with my E-85 experiment. It runs just fine with no noticeable difference in power, but gets me a whopping 14MPG in the city and 21MPG highway vs 17.5/26 w/E10. Also, in the few tanks (about 1000 miles) I've ran it, my oil has turned considerably darker on the dipstick. I'm concerned about blow-by and fuel dilution from cold weather/driving like a jerk.
Here's my oil stash options on hand:
5Qts of PUP 5w20
5qts of M1 5w20
(both of these will have one bottle of QSUD 0w20 added (6qt sump))
6qts of Meijer Autoquest (Warren) synthetic 5w20
QSAD conventional 5w30 (I have a 6 gallon ecobox of this)
Filters on hand:
M1 EP M1-210A
Motorcraft FL-820S
I spent about 20 minutes last night trying to eenie-meenie-miny-mo it, but just can't decide.
FWIW, I'm done with my E-85 experiment. It runs just fine with no noticeable difference in power, but gets me a whopping 14MPG in the city and 21MPG highway vs 17.5/26 w/E10. Also, in the few tanks (about 1000 miles) I've ran it, my oil has turned considerably darker on the dipstick. I'm concerned about blow-by and fuel dilution from cold weather/driving like a jerk.