Unfortunately or fortunately for the dealers, you can not change the oil in the newer models. Sharans like some other models don't have dipstick. And come with the life time sealant. You will have to take it to a garage to get it checked or changed. Mine had a same sort of problem and it was diagnosed as a gearbox fault despite filling the oil. It seems like quite common problems in these Sharans, Alhambras and Galaxys (similar cars)
Intrbl
July 2008