Originally Posted By: max45
I have honda civic 00'with 280k on odometer, or just to continue using hm motor oils like before? Any advices?
I'd be blown away if your engine has a flat tappet camshaft design; ZDDP concerns are an issue with older design engines such as two of the four in my sig, notably at break-in and with high spring pressures. Even if your engine design included flat tappets ... at 280K, adding ZDDP won't matter much. Yes, continue as before or try a HDEO like Delo, Rotella, Delvac, etc.
Kevin