I recently encountered a problem with one of my street rods that forced me to think objectively about engine oils, oil pressure and engine lubrication.
Risk vs. Reward: When it Comes to Oil Pumps, Knowing Whether to Reuse, Rebuild or Replace Can Be a High Pressure Proposition
Most engine builders appreciate how important good oil pressure is for proper engine lubrication and longevity. They also know that low oil pressure can cause engine noise, bearing failures and customer complaints that result in an expensive warranty claim.
Jeep 3.8L Oil Pressure Problem Many late model 3.8L Jeep engines are losing oil pressure at the oil pump due to failure of the bypass valve. This results in destruction of not only the crankshaft, but the connecting rods. To fix the problem, you need to find the bypass valve inside the plastic timing cover.