Selva 80 h.p.
Avon5.4 …… Confirm early Selva engines were pre-mix Models only. However, from 1994, engines above 40 h.p. used the OMC VRO Auto Lube system with the external oil tank. From 2002 Selva fit mechanical oil pump system similar to Yamaha instead of the VRO system but again only on 2T models from 40 h.p. upwards including the LPDFI models. This system has an internal tank under the hood.
Your 80 h.p. pre-mix model with PT was probably manufactured in the late 1980’s or early 1990’s - however, if you remove the engine hpod there is a series number (1000) and engine number stamped into the cylinder block - you need to quote these numbers when ordering parts so you could also request the date of manufacture.