This week on The Best of Car Talk, Richie tried to save money on oil changes by installing a dual-filtration system on his truck. The resulting acrid smoke seems to prove Tom and Ray's mantra that, "It's the stingy man who pays the most." Elsewhere, Mare's husband accidentally inflated their tires to 90 PSI. Should Mare get rid of the tires, or her husband? Also, Scott's beloved "Uncle Know-it-All" gave him some questionable transmission advice, so he's turning to two Know-Nothings; John's trying to slow down his lead-foot son by putting blocks of wood under the gas pedal; and did you know that William Shakespeare was Italian? Neither did we, but Tom and Ray seem to think he was. There's much ado about a whole lot of nothing, this week on The Best of Car Talk.