The owners manual doesnt differntiate between the IL and others when it comes to fluid. The sticker on my resevior was dirty, so I couldnt read the warning that said only use Pentosin, so like any responsible car owner, I did what the owners manual said. Got a good reaming from the stealer. Only added about 1 quart AFT, so no harm done really, and have sucked fluid out of the resevoir and replaced it with pentosin.