Don't be intimidated into fixing every little oil stain on a 12 year old
car. They're not significant, will not cause a massive failure or even
oil consumption. Leave them and DON'T put additives into the
As to what oil to use in the engine see:
and change the engine oil and filter every 7,500 miles or 5,000 miles if
that makes you more comfortable. Change transmission oil and filter
every 30,000 or 35,000 miles.