I watched One of John Mummerts U-Tube Videos regarding installing Oil Pan. He uses Permatex Grey as a Sealant on both sides of Pan Gasket. On the Block and Oil Pan. Is there a reason for using the Grey instead of Black? I also watched His Video on installing Rear Main Seal. He mentions that He believes the majority of Rear Seal Leaks are NOT the Seal itself but the Side Seals. He showed how He coats Side Seals with Silicone to hold in place on the retainer and then installs the retainer. My Question is why are the Side seals still being used when the Space where the Side Seals go could simply be filled with Permatex "Right Stuff". I can tell You from experience that doing it with "Right Stuff" will not Leak. I did mine a few Years ago and had no Leak. when I took it apart to rebuild it I had to cut the sealant with sharpened thin Putty knife to get the Retainer out. It would flex but not separate with the Bolts out. The Side Seal Space will not allow Oil to Leak if filled with Sealant. He mentioned in the Video that in the rare Occasion that Rear Main Seal does Leak when installed His way He simply redoes the Rear Main Seal. I like my way much better than even His way of doing it. Thoughts?