sorrie to start another forum but it didnt relate to my other forum much... a quote from one of the FAQ's on this web site..sorrie if i dont site correctly "The advantages? Longer intervals between oil changes are possible because synthetics suffer less breakdown due to the better base stock used. Usually the synthetics will have a better additive package, allowing the oil to clean better among other things. Word of caution!, Not everyone needs to use a full synthetic oil. There is many times a good mineral based or synthblend will do just as well. Changing to a full synthetic on an older vehicle (for example) can cause leaks in the seals, the detergents can break loose accumulated sludge deposits which in turn could clog oil passages and cause other havoc inside the engine. It's best to consult a lubricant specialist / mechanic to determine what your options are." ok now that a full synthetic in my 91 honda accord (SOHC i4 24 valve) is bad right?? according to this..in an older engine it can be hazardous and i should stay away from it, but how about synthetic blends?? wont that be hazadous? should i jsut go with mobil one drive clean? link: http://www.mobildriveclean.com/oil/index.jsp instead of the syntetic blend like this one http://www.mobildriveclean.com/blend/index.jsp thanks guys i appreciate it.