You went a year on the first one? Don't they say like 1000 miles for the first change? You can tell when they need changing just by feeling the aluminum filter head. If it's really hot, coolant is flowing through it, if it's just warm from heat under the hood and not really hot, nothing is flowing and it needs changing. I use the dieselsite setup too. They're the same thing, just pick which colors you like best.
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