New to me Honda Civic lx 5 speed coupe. Bought from original owner,has 165,000 miles. Never has seen sythetic of any kind,mostly green bottle quaker state or pennz.yello bottle he thinks??? Car is driven in Michigan winters. Driven daily to work about 20 miles round trip. Not much freeway,but some. Doesnt leak or consume oil. What would be a good choice of oil for me given the circumstances? Thank you all so much. Open to hear all opinions. High mileage?synthetic? So far only has seen dino.