R95/99/100 (oil resistant), P95/99/100 (oil-proof).. the N in N95 stands for "not resistant to oil". https://en.wikisource.org/wiki/NIOSH_Guide_to_the_Selectio

R95/99/100 (oil resistant), P95/99/100 (oil-proof).. the N in N95 stands for "not resistant to oil". https://en.wikisource.org/wiki/NIOSH_Guide_to_the_Selection_and_Use_of_Particulate_Respirators_Certified_Under_42_CFR_84/I._SUMMARY_FOR_RESPIRATOR_USERS https://en.wikisource.org/wiki/NIOSH_Guide_to_the_Selection_...