AS A OVER THE ROAD TRUCK DRIVER I HAVE USED THE HEAVY DUTY OIL STABILIZER IN MY TRUCK AND WAS SO HAPPY WITH RESULT'S THAT WHEN I ORDERED MY FRIST NEW 2005 CADILLAC DEVILLE LUCAS SYNTHECTIC HAD JUST CAME AVAILABLE AND I USED AT IT'S FRIST OIL CHANGE AT 3000 MI. WITH SYNTHECTIC OIL CHANGE AND KNOW WITH OVER 55,000 ON THE CLOCK IT JUST AS SMOTH AS IT WAS WHEN NEW. JUST TAKE THE OIL CAP OFF AND LOOK INSIDE CLEAN AS THE DAY IT WAS MADE. IT'S POWERED BY LUCAS.