Rear main seal leak on 1996 Tahoe 5.7

[Atrain1]

try the white shepherd

I found it online for 12.95 and I want to say I used bars leak the last time. I am not used to using stop leak to fix leaks, I like to do it the right way. I have had some recent accidents so it will be a bit until I can work on a car. Have you ever used Bars leak and if so how does it fair up to the White shep
herd?