i have been useing svo for approx 3 years now in my 95 300d and 87 sdl,i really encourage you to read up on infopop svo forum.gathering oil is just the first part,its essential you make sure suspended water is removed and hot pan test needs to be done-this info is available on svo forum.you cannot really tell much by looking at oil other than really dirty black oil.it can be a steep learning curve-good luck