Do I need synthetic oil
i just spent quite a bit of time researching oil filters, and have read some forum information from Bob Is the Oil Guy. I'm thinking I'll stick with either Quaker State or Valvoline 5W-30 for the cars in question. I have a 2000 model Honda Odyssey van, and a 1994 Pontiac Grand Am my teenage son drives.
We do city driving in semi-harsh conditions due to normal traffic lights, some rush hour traffic, but nothing severe. The van sees 15,000 per year. The Grand Am sees about 8-10K per year. I've been changing the oil at 5,000 or 6,000 miles along with the oil filter in each vehicle.
I live in the Dallas area (warm climate). Do i need to change anything?