Originally Posted By: Quest
Do not use silicone grease of any sort. If it gets into the fuel rail (which it will, trust me on that)
Yes and no.
I am fully aware of silicones nasty habit of poisoning Oxygen sensors, but you're not globbing it on, your putting a extremely thin film on, not enough to see, or wipe off. I've done it on some part into plenum o-rings that refused to go in, and injector o-rings, to no ill effect of oxygen sensors.