Sink marks on polypropylene plastics are primarily caused by the uneven cooling and shrinkage of the material during the injection molding process. To eliminate these, consider optimizing the molding conditions by adjusting the temperature, pressure, and cooling time. Increasing the holding pressure and time can help pack more material into the mold, reducing the likelihood of sink marks. Ensuring uniform wall thickness in the design phase can also mitigate this issue, as thick sections cool slower than thin ones, leading to sinks. Additionally, using a mold temperature that's high enough to allow for proper flow but not so high as to prolong cooling excessively can strike the right balance. Material selection plays a role too; consider using a polypropylene grade with a lower shrinkage rate. Finally, optimizing the gate location to ensure even flow and pressure within the mold can minimize sink marks.

Your truck's "reduced engine power" warning is a safety feature signaling when the onboard computer (ECU) detects an issue limiting the engine's capability to prevent damage. Common triggers include problems with the throttle body, sensors (like the mass airflow sensor), fuel system, or faulty wiring. It's designed to protect your engine from further damage by reducing its power output, allowing you to drive to a safe location or a repair shop. Immediate attention is recommended to diagnose the exact cause, which often requires a professional scan tool to read the fault codes stored in the ECU. Ignoring this warning could result in more severe damage to the engine or the vehicle's systems, and addressing it promptly can help prevent more costly repairs while ensuring your safety on the road.

The molar gray cloud 2126-600 is similar to the zircon from Xuanwei.