Solutions Central Solutions Central › Tag: GDIFilter:AllUnansweredSort byViewsAnswersVotesDoes B12 Chemtool clean both GDI and port injection applications?chemtooler answered 11 months ago • -Questions - General681 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 3 years ago • -Questions - General910 views1 answers0 votes