When a vehicle is driven regularly, rarely is it in one spot long enough to detect more than an occasional driveline fluid drip. So, unless something beneath necessitates crawling under to repair, the ...

If oil isn’t dripping from beneath your Jeep TJ’s inline-six, it’s because it’s either brand new or the rear main seal has been replaced within the last 40,000 miles. That’s just a fact of four-liter ...

Technology has continually improved the way that auto manufacturers seal their engines. Yesterday, gaskets constructed of cork or paper, and packed-rope rear main seals were commonplace. Today, Teflon ...