i just got my 1st boat its a 1977 larson with a mercruiser 898 type 1 stern drive..i was told i should change all oils and gear lubes..the boat has no manuals with it. my ? i got some high viscosity lower unit gear lube..is this all i need to grease the stern drive or is there more and if so where..is there a certain weight i should use..And what type and weight oil does this motor use<br />thanks in advance