Re: What should I do in addition to oil change on H3!
GM recommends against using any types of oil additives. One they may actually degrade the oil and your oil life system will no longer be accurate, two, they are a waste of money.
As for Techron, it is the best injector and top engine cleaner made; therefore a bottle every 10K won't hurt anything, even if not needed.
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Black Sheep Hummer Squadron
(ME TOO)
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