So about 3 days ago I changed my oil to m1 5w30 high milage full synthetic I had a bitch of a time because whoever did it before me tightened the filter on there like it was a lugnut. Besides that I was wondering what is a safe oci on these motors with that oil and also wondering how do ppl like this oil in these cars I have a newer car besides this and always use a cheap oil cus I have warranty and do not plan on keeping car so money saved is all I care for but as far as this rolla goes I am loving 30mpg average so I want to keep alive and have heard of these having piston ring problems and don't want it to get me