thanks for looking dumb questions i no firstly : what is the best grade oil to use im thinkin this any comments plz guys: http://www.opieoils.co.uk/p-60219-millers-...engine-oil.aspx and also is this adaptor the right size for my hks dump valve to fit on to the oem hot pipe dump valve bit? http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...e=STRK:MEWAX:IT thanks