I am looking to do a oil and filter change. I am swaying towards Shell Helix 10w40 Semi Synth. My car is a Vectra B 2.2 sri 150, 88k. Has anyone used this exact oil? Would anyone recommend it and would this be ok to use in my car? Also I am looking to get a sump plug washer, does it come with a new o ring seal and does anyone have a direct link for one to buy, or the part num. All of the help and replies is greatly appreciated.