Car: 1990 Saab 900 200,000 miles non-turbo I guess I'm still a bit confused. I've been searching through the boards and Castrol GTX high Mileage and Penzoil High mileage seem to get good reviews. Should I use one of these 10w-30 year round? I live in Southwestern Connecticut (near New York City), it doesn't really get to cold or too hot. Is there any advantage to going to the Delvac 1300 for Spring, Summer and fall or should I just stick with a high mileage 10w-30 oil year round. Like I stated earlier, I currently use Valvoline which seems to take a beating around here. Unfortunately, I have nothing to compare the Valvoline against. I changed the oil the same day I got the car so cannot compare its efficiency against anything else. I just want to be sure I'm doing all I can to extend the life of the vehicle. I'm not particulary interested in extended drains as I plan to change the oil every 3k and I'm not cost conscience either, although I don't plan on springing for Redline or anything like that. I also don't plan on switching to a synthetic. What do you guys think. I want to change asap so I can get that fram oil filter out of there!