Hello,new to the site.I have a fairly low mileage 2011 Mustang 3.7 V6 convertible.I purchased it a year ago with 2100 kms on it.Sunday go to church car basically.I changed the oil at 4400 kms(just because I wasnt sure when it was done last),it was still clean.I had Jiffy Lube install Pennzoil Ultra Synthetic in it at the time,$175.00 later.Ouch!10 months later Im at 12,000 km,5700 done in 2 weeks on a road trip this summer and I am looking for advice on the next oil change,hopefully not another $175.00.The car is a fair weather car and a lot of short trips around town.I drive it very easy.Thanks.