Today's oil, specially the HDEO have excellent base stocks which are shear stable as well as formidable additive package so zinc etc. is no longer necessary, however, one of the favorites of oil treatment, the STP oil treatment has good amount of zinc and is still an allowed additive by the EPA, for long drives in Rajasthan heat, I add it to my crankcase as an extra protection along with Delo 400 or Delvac MX.
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1999 Trax Gurkha
1996 VFJ Jonga
1995 Accord V6
1995 Honda RC 45 |