The front door knob/button bit is sticking occasionally of late. I press it to get in the car, it presses in fine and releases the door lock, then sticks in. Needs me to put the key in to get a purchase on it to pull it out again.
Was going to WD40 it, but thought I'd check first with my learned friends what lube to use for long lasting fix. There is no mechanical noise of illness, just seems to be sticking a touch.
Used wd40 with the straw thing on to disperse any water then got a can of white lithium grease or summit like that and then gave it a squirt, that was about a month ago, goes in and out lovely still
Don't forget to try and get some round the outside if the barrel too
I had this on my 2003 156 a week after I bought it last Dec. I'd get in not noticing the button had stuck and the door would just bounce open when pulled too and I'd have to get out again to ease the button out with the key.
I squirted in WD40 around the button loads to wash any dirt/grit away. Then when that dried out I used a little engine oil in a trigger can. I wiped it away several times while working the button so no oily thumb. It's been fine for the past 6wks and through these frosts.
All fixed. Rag, can of GT85 and a lot of poking. First the spray pulled off the muck, then the gritty noise went, then smooth service has been restored. Nice trail of GT85 residue down the door to add to a winters load of muck and road filth. Must clean it soon.
There is a screw (torx, if I remember correctly) in the side of the door. When you screw that off, there´s a straight hole to the lock. Spray oil there (I use gun oil). This way you don´t mess the whole door with stripes of oil and dirt...