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1st Gen Ram Tech'93 & older Rams: This section is for TECHNICAL discussions only, that involve 1993 Rams and older. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
any oil as long as it registers on the dipstick. these old trucks really don't care. personally i run shell rotella 15w40 since it is a bit thicker and has extra cleaning additives to keep the engine clean