Just trying to get some clarification on what steering fluid to top off my 06 Range Rover with. I know the manual says Texaco, but what is the equivalent. I have a bottle of Pentosin 11s and the Pentosin 7.1. The 11s is synthetic and the 7.1 is mineral based. Can I use either one of these to top off? I could buy the GM equivalent, but I have the Pentosin in my garage. Thanks.