Solutions Central Solutions Central › Tag: GDIFilter:AllUnansweredSort byViewsAnswersVotesDoes B12 Chemtool clean both GDI and port injection applications?chemtooler answered 2 months ago • -Questions - General200 views1 answers0 votesShould a gdi engine be run at a high rpm during valve cleaning? Must I change oil when process is complete?chemtooler answered 2 years ago • -Questions - General589 views1 answers0 votes