- Jun 4, 2013
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Hoping someone knows enough to guide me here.. I just purchased a 2007 Volvo XC90, V8 AWD w/ 6-speed tranny. It had 78k miles. I just drove it diagonally across the country about 4000 miles. Along the way, I noticed (fairly soon) that when I got off the highway, the car would shudder at 1500 rpms. I could stop this shuddering by increasing the rpms, either by accelerating, or by manually downshifting in tiptronic mode. I also came to notice that this shuddering only occurred when the engine was hot, but didn't seem to occur when the engine was cold. I immediately took it in to my volvo dealer, and they told me that a) someone had put incorrect fluid in at some point, either by mistake, or because they were trying to correct an existing problem, and that b) they recommended i get a new transmission for 6700 dollars. I asked about replacing the transmission fluid, and they responded that it would be a waste of money. I've read on another forum, though, that someone with the same car, having the same problem, replaced their cheap fluid with the proper and expensive synthetic, and that the studdering went away. I don't know however if that was a lasting fix, or just a temporary bandaid. At this point however, I don't see why the car isn't driveable, and feel like I should take the chance with replacing the fluid. It seems like the fluid alone can cause this studdering problem, because the viscosity is throwing off the pressure sensors. Am I wrong? If i have to replace the tranny anyway, is there any further damage that could occur by not doing it immediately? Thanks!