My '88 Mazda 323 (owned since 1993, sold last yr with 220k miles) had a smoke at start-up issue that started about nine years ago (and it could put out some plumes for the first minute or so). I went to Maxlife, and then to Castrol HM, then ST HM, and finally M1 HM. Everyone of them did an excellent job of pretty much eliminating the issue. I would definitely recommend ST HM for this particular issue.