What is power tilt and trim fluid - alternative?

[Paul aka watertaxi]

What is quicksilver power tilt and trim fluid?

Is there a common oil or atf/steering fluid I can substitute without damaging the merc trim pump?

[rcig]

back in the 70's we used 30 weight non detergent motor oil

[CDK]

Instead of quicksilver fluid you can use any thin mineral oil SAE5W or SAE10W, sewing machine oil, chainsaw oil etc. The system is not suitable for ATF or braking fluid because of the material used for seals!