Sunroof Drains, Honest Oil Changes & a Flash-Fixed Buick

Quick hits this week: why sunroof drains are “house gutters” for your car, the oil-change must-dos most shops skip (clean work, proper torque, new crush washers), and a Chevy 2500 6.6L gas with rising oil consumption—what to ask the dealer and why it can cook cats/O2 sensors. Plus, a 2013 Buick’s harsh “slam into Drive” solved by the second factory software update (Opus IVS). Next week: Mercedes-AMG with Matt DeLorenzo.

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