Loose or deteriorating powertrain mounts require careful inspection to spot. Look for missing chunks of rubber, severe cracking, oil soaking and separation of rubber form the metal. Also check for loose, broken of missing retaining bolts. Don't forget the dogbone struts on transverse engines. If they're deteriorated, consider a premium aftermarket replacement that has a hydraulic damper.

Some north-south engines have a mini shock absorber to reduce vibration. Disconnect it at one end, compress and extend it, and if you feel any lost motion or roughness, replace it. North-south engines also have a mount at the rear for the transmission.

A few require special vibration dampers, which resemble a stack of rectangular plates, bolted to the transmission. A loose damper doesn't do its job, so make sure the retaining bolts are tight.