The purpose of this thread is to establish once and for all, a data base of everyone who has ever experienced noise issues with Mobil 1 synthetic oil. This way members will have a source of reference to turn to if they suspect their engine is experiencing noise with Mobil 1. Many of you have already described your noise issues on other threads, please do so again here. By getting everone on one page, we can then establish a trend line as to which engines experience this issue and perhaps why. Please list the following information: Your vehicle and engine. Mileage on vehicle. Mobil 1 type and viscosity. Description of noise.