With previous vehicles I've always had services done by mechanic or dealer. Recently I've become disappointed with their service and price and want to start doing them myself. I just purchased a used 2005 Elantra with 71k miles. It appears to be in great shape with regular servicing. I'm going to do an oil change this weekend and would like to know the best weight/brand. -2005 Hyundai Elantra GLS -2.0L 4 Cylinder -71k Miles -35mi each way to work and mostly short trips through the day. -I near Seattle, WA. cool/moderate temperature -easy driving style aiming for decent MPG Few questions: Should I put in some Seafoam or another 'engine cleaner/flush' prior to the oil change? Should i switch to synthetic at this point with 71k miles? I planned on purchasing the an OEM filter from the dealer for $7, is there something better? Also- I plan on either driving this vehicle into the ground as a commuter or giving it to a family member so I'd like to get the most life out of it. Thanks!