Oil sludge and guarantee extension

Dear community, dear hangover, I have just received the AUTO-Bild-Newsletter by talking about a warranty extension for various Saab engines of the years 1998-2003, because they mud faster in cold temperatures. Since Saab allegedly spares a recall action, the engine guarantee is to be extended to 8(!!!) years. Do we have to worry?I have already reduced the intervals of the engine oil change to 10,000 km! Thanks for information and tips on what to do to secure demands! S Aabian greetings mrbean95