Hey guys, need some advice or tips on my oil change in a week or 2. I notice the previous owner is still using 5w20 from 7k miles to 162k miles. I also notice at cold start if I try to move the car, its much harder to get the car running smoothly without choking(Fine after you take it to temperature or run it for a few minutes). Car is fine if I start at noon with warm temperature or let it sit for 10 minutes in the morning. The guys probably been getting oil change at sears since I can see the last oil change done. My choice is Mobil 1 10W-30 Extended Performance Full Synthetic Motor Oil. I have also saw some post about rotella t6. Anything will help. 2001 with 164k miles. Thanks for reading!