Fuel injector reinstall o-ring lubrication?

Is a very light coat of motor oil or petroleum jelly the most recommended, for reinstallation back in intake manifold and fuel rail?

My Toyota Supra manual said much the same thing although they also indicated
"spindle oil" was acceptable. No Toyota service department I called could tell me what "spindle oil" was. So I used what I would use to lubricate a spindle and grabbed some 10w-30 and it worked perfectly...

I support this. From an engineering stand-point, gasoline is much more volatile than motor oil. I'm having a tough time seeing how motor oil would make the o-rings swell and gasoline wouldn't. I always use motor oil.

Very light motor oil.

All my manuals state that, and my fuel injection manuals do too.
And i have been trained also to do the same.

Dont use silicone, because it will ruin the o2 sensor.

Those O rings on the fuel injectors should be designed to withstand gasoline and oil. The bottom oring is in contact with the stuff all the time and needs to survive that condition the rest of its life. Most cars have two o-rings on the injectors, unless it is the vortec engines on Gms or other very different injection systems. The two o ring design, one is exposed to the cylinder, and the other is just exposed to the fuel line.

Dont read what a japanese manual states, they dont know how to build cars.
Go read my nice flame in the domestic vs rice thread.

gasoline ONLY, oil or PJ will swell the gaskets.

i guess it depends on the condition of the holes you're squeezing the gaskets into. gasoline indeed has almost nil lubricating property.

i should have said that i was quoting the manual on the fuel injector seals. i recently had to do a starter on a '98 LX470, and you have to pull the intake, fuel rails, and most of that harness to get to the starter.

That depends. I used gasoline only to try to install the injectors on my
1985 Supra and ended up shearing about half of the VERY expensive O-rings into shreds in the process because of the zero lubrication properties of gasoline. A subsequent fuel pressure test made my fuel system look like my lawn sprinkler system.

After replacing the damaged O-rings, I applied a light coating of motor oil, smoothly installed all the injectors and drove the car for 120,000 more miles without the slightest incident.

Easily attributable to poor translation from Japanese to
English.

[not to mention]
Lubing the O-rings with gasoline implies that there be an open container of gasoline to use during the lubrication process, open container of gasoline violates common sense and shop safety practices.

Shame on Toyota.

If indeed Toyota O-rings swell from being lubed with motor oil, shame on Toyota.

My factory GM service manual calls for clean motor oil.

Interesting. Looking at the manual for my Corolla, it states:

"Coat each O-ring with a light coat of gasoline (NEVER use oil of any sort)...."

Different strokes for different folks I guess...