I use the new fiber washers supplied by the VOC spares co under the banjo (much softer than the usual red fiber washers, as these are way too hard) and I use 1/4 ID Dowty seals only directly under the head of the stock 1/4 BSF bolt. Done this on every engine and never had an issue...........On the tapered face of each pipe fitting I wipe a small smear of 518 loctite which is a red flange sealant and put a drop of engine oil on both the thread of the pipe nut and the flange face that it pulls against. This will ensure that the nuts pull up nice and firm without any "Tight spots" as you tighten the nuts, do this after nipping down the top banjo securing bolt, you need to do this or else the pipe fittings will twist. Start from the very front and work towards the rear, that way you can adjust for accurate alignment as you go. Do not over-tighten the top bolts and the pipe nuts need to be nice and firm. If you do all this correctly, you should suffer no oil leaks. Good luck..............Greg.