mpt
Contributing Member
My 1981 Bayliner 3220 runs twin Volvo Penta BB140A's with MS3 inboard transmissions. For years when you pushed the black shift lever forward on the port engine, it took about a minute to engage fully! Last summer I changed out the transmission oil in both. The oil was pretty old, dark and stinky for not being changed in quite awhile. I replaced the oil last summer with what the Volvo manual said to use the same oil as you use in the engine (5-30wt). The shifting issue was still the same! Last week I drained the 5-30wt out and filled with Lucas Transmission Fix. Now it shifts forward immediately! Question is- should I leave the Lucas Oil in that port transmission, or run it for a several hours than change back to the 5-30wt oil?