Hi All,

I think my 1990 F150 may have a leak in the R-134a converted A/C system. I'll verify w/a sniffer and gages I borrowed from a friend.

Meanwhile, my question is: If I have to evacuate the system completely in order to fix the leak, how much oil do I add back in the system? I'm sure some of the oil will probably remain in the system even after evacuating it, but not sure how much. I suppose I'd rather have a little too much oil than not enough.

Thanks,

Matt