Kilgore47

If you only use one quart a year I wouldn't worry about it.  How many miles is that?  Next I'm going to say something that will probably get me several comments.  But since you are using a 10 \ 40 oil - you might consider using a 20 \ 50 oil instead of an additive.  It's your car and from what you have described - if you don't change anything your car should be fine.

I keep starting fluid in my shop.  I have an old Jeep that refuses to start if I let it sit too long.  A shot to the air cleaner and it cranks right up.  After that - no problem - starts every time.  Let it sit for two or three weeks and it just wears the battery down trying to start it.  I have replaced the ignition system, by passed the computer and rebuilt or replaced most of the fuel system.  It's just an old worn out engine.