Hi guys, I just picked up a 2001 Honda civic lx (1.7 sohc) 1 owner car,150,000 miles. I took it to mechanic before buying and checked out great. No leaks nothing. Original owner said he has used pennzoil yellow bottle every 5,000 since new. I get it home, put new plugs, changed the oil with maxlife red bottle 5w20. 300 miles into oil change I see small leak develop. Was bone dry before. I rechecked drain plug and filter, all tight no double gasket. Im confused. Should I drain this out and go back to penzz. Yellow bottle. And should I stick with 5w20 or step up to 5w30. Does not burn oil either. Sorry for such a long post. Just a bit worried. Thanks all.