Tried the Valvoline SynBlend Premium "Blue" HDEO. It was golden brown so maybe they used to dye it blue! As expected, for a synblend HDEO it's results landed where the Delvac 1300 15w-40 Synblend and Delo 15w-40 Conventional did. No surprises. Presently have STP/Amalie 5w-40 HDEO in the crank case and will run it 15K-20K depending on the time. I don't commute as much and so my miles traveled a month dropped from 2500 to around 1500 so it is taking me sometime longer to rack up the 15K to 20K miles needed. I wish I had a borescope but from what i can see through the oil filler hole, the top end is spotless with zero varnish. The dipstick is varnish free as well.
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