we are all rolling the dice driving 20+ year old cars, most with multiple POs spotty service records, years of low cetane low grade US diesel use, 200+k miles, so why not save some money and run some wvo. My dice are lucky as I have over 40k running tw-tank wvo system on this car and had 25k on an 84' 300tdt before selling it for 6k three years back.