when ever the new api oil tests come out, chevron delo passed em first everytime. usually with the oil that was already shipping. After doing all the research for a company I worked for, I quickly realize why the chevron is always the first oil sold out at most stores. even when it cost more, the first to pass new tests, the first to develop new additive packages for oils. at least in the past.
however I will use rotella or delvac as well.
It was chevron that developed the hydrotreatment process for making the group III ultra pure synthetic base oil that almost all modern hd oils use today. other wise you have to go with the natural gas developed based ester synthetics bases. The additive package that chevron developed 10 years ago was showing a million miles between overhauls on big rig trucks. Sadly that additive base was modified for the new catalytic converters and is not a robust as it used to be. The old additives were so good that they coated the high wear parts but also coated the catalytic converters as well. so moly and zddp (Zinc) additives got reduced.
Sadly companies that do the best work and are number one, only seem to last about 10 to 20 years and then some bone head cuts the research dollars to "maximumize profits" and then there are the mergers and acquisitions. so every american company ends up destroying itself from within when ever the founding leader leaves.. So we will probably see some jap or euro company take the lead in the near future.
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