The U.S. aircraft register, updated daily
Parts

Harrison Oil

No failure report names the harrison oil. 2 FAA approvals let 1 company make a replacement harrison oil, Li'L Red Aero INC holding the most (2).

Approved replacement parts 2 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a harrison oil and sell it as an approved part for the models named. These are the companies holding such approvals for a harrison oil:

For these models most: Maule M-4 (1).

MakerPartReplacesFitsGrantedStatus
Li'L Red Aero INCHarrison Oil Cooler SF 10804Modification PartUnivair Aircraft Corp 108-1, 108-2, 180-31996-04-23current
Li'L Red Aero INCHarrison Oil Cooler SF M4005Modification PartMaule M-4-220C1996-04-23current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.