These vehicles are getting so high tech that there are warnings (some are in our H2 manual)NOT to introduce additives into our drivetrain systems. Seems that the computer adjusts for emissions and some of these additives could affect the electrical signals for engine timing - at least this is what I gather from some service techs.
I've used some of these products in the past and can't say that I saw any improvement or value in using them...But, there are probably folks in the forum who will swear otherwise.
For me, I'm staying away from the additives.
JJ
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