quote Originally posted by fierosound: I used Canadian Tire's - Motomaster Synthetic Extreme Pressure (it's pink) PN 28-0804-4 I used this when I reconditioned my Indy's headlight motors. Seemed to work very well. I also use this for the all chassis/balljoints etc. lubrication.

Maybe they change their product designation and/or the part number or it is simply not available thru their website. I will have to go in a store to look at it.

Well, I made some research today about lubricating plastic part (gears) and I stumbled on a very interesting article here: http://motionsystemdesign.c...0894plasticlubes.pdf

Aside from the obvious fact that its never a good idea to lubricate plastic parts with petroleum based lubricant, I read about not so obvious fact that some additive (mainly EP(high pressure) and anti-friction) can contribute to plastic deterioration more than we thought.

So with all the info I gathered on the net, I foud some type of grease that are suitable for our use in the headlight motor gearbox. Some are really easy to obtain. And they have all the required spec to be the good choice to use with plastic gear and metal on metal combination.

Permatex Ultra Slick Synthetic Multi-Purpose Lubricant with PTFE
Dow Corning Molykote G-2001 (Synthetic grease free of solid lubricants for enclosed plastic and steel gears)

They are synth based grease. Synthetic hydrocarbons .More stable in the long term.
Safe for plastic and rubber parts
Will not dry.
Very low oil separation.
They contains anti-friction additive that are ok with plastic : PTFE (Teflon)

The choice of katatak is a good choice but maybe not the long term if I look into the article...it contains moly or something like that. This kind of additive can penetrate the plastic and cause its failure. Very surprising. Its not always the case. And difficult to know for us if it can be the cause of our future failure.

At home I have the other one, the Permatex Ultra Disc Brake Caliper Lube...the green gellyish stuff. But its prone to oil separation (my own experience). Its not very good in the long term also. But its a better choice than nothing.

For people that are using new brass or alu gears, no problem on this side.

Thanks for all your advices, and your suggestions. It helped me to find some , maybe, better solution to keep my plastic gear in good working condition for years to come. If my reading and thought can help you too I will be happy.

[This message has been edited by perry rhodan (edited 07-28-2009).]