I have seen a lot of questions and comments about these 2 things lately and have not seen a couple important qualifiers. I have no formal training in either of these subjects, just an old farmer, so feel free to correct me or add input.
2 post lifts by their nature apply a lot of prying force to the surface they are bolted to. My lift required 8” of reinforced concrete minimum. It is a 9000lb 10’ lift. If the lift you are looking at is a free standing version with no plate or bar connecting the 2 posts at the top, make sure you read the literature about concrete thickness, tensile strength and minimum reinforcement in the concrete before you purchase it. The average residential garage floor is not not designed for this installation.
I was raised to always grease bolts or studs when assembling something. As my grandpa taught me, “If you think you will ever take it apart, grease it!” Any type of thread lubricant used during assembly significantly alters the torque value needed to tighten the bolt or nut. I believe torque values are established with dry threads. The style of bolt or nut also affects torque value. For example, if you change a standard nut to a flange head nut, the torque required to keep it tight is much less. This of course depends on whether the torque rating is aimed at the stretch of the bolt or the friction required to keep it from backing off.