Just done a change of oils in box and engine and cant believe how much better it is,used castrol syntrax last year but wasnt too pleased with results,this year have gone with oilmans recomended millers 75w90 nt,it flies into gear now so im well chuffed as it was p1ssing me off when changing gear was awfull.may have put .2 of a litre over tho will that be a problem ?should i drain a bit out ?