what oil should i use for my 1984/85 mercury power trim

[richard1969]

Hi,please can someone tell me what is the best oil to use for my power trim.There are a lot of people saying different things.The engine is around 1984/85 and is the 115hp brown belt 6 cylinder and the the trim is the 3 way 1. Thanks Richard.

[Moody Blue]

Is your pump/reservoir in the boat or on the motor? It is about that year when the PTT design changed style.

Generally automatic transmission fluid is used in the "newer" systems. Older systems sometimes used 10W30 motor oil. Seems the older systems would operate on just about any liquid Always use the same type of oil when topping up the level. Don't mix oil types.

[Chris1956]

As Moody said. if the PTT unit is the pump in the boat style, and the existing PTT oil is brown/clear, it is motor oil. Use 5W-30 to top it off. If the existing PTT oil is red/clear, it is Auto Trans fluid. Top it off with ATF.

If the PTT unit is mounted on the motor transom bracket, it should take ATF.

[richard1969]

Hi,thanks for this the motor is on the engine so will use 5w-30 motor oil.hoping to get her blead this weekend so if i have any trouble regarding anything else will be in touch. Once again thank you. Richard.