Simple, conventional mineral oil, sometimes called dino oil, works best for the cleaning phase and rinse phase of an Auto-Rx^® motor cleansing. With conventional motor oil, there are no polar ingredients attracting oil to metal surfaces. This is important in facilitating the release of dissolved contaminants to be carried away by the host motor oil. With a recommended 2500-mile run for cleaning with Auto-Rx^® installed, and an important 3000-mile rinse phase, running conventional oil for these relatively short oil-change intervals will also save you money. Whenever possible, utilizing this recommendation will maximize the effectiveness of your Auto-Rx^® cleaning application.

The engine protection offered by conventional oil over a 3000-mile oil-change interval is equal to a more costly full synthetic. Motors that are specified for synthetic only are due to a corresponding long drain interval. By long drain interval, we mean 5,000 to 10,000 miles. If you cannot find the proper spec conventional motor oil, we suggest running a Group III synthetic oil, which is merely ultra-refined conventional oil. The use of a conventional mineral oil is essential in addressing seal leak issues.

If for no other reason than cost, using conventional oil for the cleaning and rinse phases of treatment makes the most sense. If you require the use of a synthetic, in spite of the added costs, then avoid those with ester or POA base stocks.

Once your motor has been cleaned and rinsed, the Auto-Rx^® Extended Engine Performance Program works extremely well with any motor oil of your choice. In conventional oils, additional cleansing will occur, as well as providing supplemental lubricity and neutralizing acidic formations. In synthetics, the Extended Engine Performance Program supports a healthy TBN (total base number) and has shown to reduce wear on metals.