Am I Do ?

[Sandun]

Some drop of oil am I put in to the ignition switch (key switch) ? MM 1000 car

[Neil MG]

It won't do any harm, but if it is a bit stiff it would be better to remove the barrel (now you will find that very easy with the key!) and use a little grease.

[rayofleamington]

In uk, it is common to use WD40 (very light oil / cleaner in spray can).
Some of the effect is to clean away dirt and some effect is to lubricate.

Putting grease in a lock could increase the amount of dirt retention and I would worry about it sticking later on.

[MarkyB]

Graphite is the best thing for any lock, scribble on the business end of the key with the softest Black pencil you can lay your hands on.

[Neil MG]

Have to disagree entirely with WD40. After it evaporates it leaves a waxy residue. It is the absolute curse of the locksmith:
http://www.clapham-locksmiths.co.uk/blog/tag/wd-40/

The locks were originally assembled with red grease. It seems today that synthetic oil and grease is recommended. And yes definitely graphite:
http://www.lockpicks.com/lubricants_1.aspx

It should be noted that there is a significant difference between greasing the lock barrel on assembly and putting grease down the key slot, which is definitely not recommended.

[JOWETTJAVELIN]

DO NOT use WD40 for switches/electrical connections - I can assure you it will wreak havoc with the contacts.
Electrical connections should not be oiled full stop.

For the ignition barrel however a very light smear of light oil such as 3 in 1 should do the job nicely. Use sparingly!

[bmcecosse]

WD40 has served my contacts and locks very well for many many years.......