I'm considering trying Motul X-clean 5w30 C3 for my next service. The car in question is a '99 Toyota Altezza (same body as an IS300) running a 3SGE Beams motor. For those of you who don't know what that is, it's a 2L twincam 16v with dual VVTi making 210hp @ 7600rpm. We've just become Motul retailers at work. Unfortunately we only get a limited range brought into the country. The other options I have in 5w30 are H-Tech 100 Plus or 300V. The H-tech+ looks a bit on the thin side for my mileage (87mi) & 300V is an overkill. My current fill is Mobil1 which the car runs very smoothly on. Everything looks good with the X-clean, higher HTHS but reading on the bottle is says not suitable to use with some vehicles pre 2005. What could possibly go wrong using it in a pre 2005 engine? Mine doesn't meat Euro IV or V emission standards or need a low ash oil which C3 is all about.