Hey guys! Just bought a 2002 Volvo xc70 2.4 turbo w/ 98,000 miles and am switching to Rotella T 5w40 synthetic for a good cleaning and there after. Owners manual says 5w40 and this seems like the best that is easily available. Thoughts? P.S- What evers in there now is pretty crusty, kind of like a bullion cube!