Fuel does not stay fresh forever. Gasoline begins to oxidize in a few months, forming sticky varnish and gum that can clog carburetors, injectors, and fuel filters. Diesel faces its own problems: as ...

Just north of where the Cousins River meets Casco Bay, Willy Leathers was powering up his own electric watercraft, which had its first outing in July. Leathers uses his 28 -foot (8.5-meter) boat for ...

I went to Sonoma for a NASCAR race and found out heat is the bad guy, fluids are the secret weapon, and Valvoline’s engineers are basically mad scientists with pit passes.