Re: Bosch +4 on a VX?
Never use Bosch on a Japanese Vehicle.. Same with Denso on a european vehicle....
Stick with what the manufacturer recommends, if it's NGK, stick with NGK, if it's Denso, stick with Denso, if it's Bosch, stick with Bosch... For what ever reason, if you use Bosch on a Japanese vehicle and Denso on a european vehicle, they don't run too well on it. My theory is that when the manufacturers are tuning their ECUs, they're basing it upon electronic devices not only sold with the vehicle but with what is commonly sold in their respective countries and electronics aren't all made the same, when you put in a different electronic device, it will output a given signal for a different scenario, however small of a difference, than the car would have expected to be. For example, for a given fuel mixture, a Bosch sensor may say it's 14.1 while the Denso might say 14.0 or 14.2, etc. People say Bosch is crap but it's usually from those who are installing it in their Japanese Vehicles.
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