I gave M1 15w50 a shot in my 96 Saturn SL2 and really like the way the motor runs on this oil. After about 3K, it's starting to consume oil. For Saturns, this is "normal", but I just refuse to consume expensive oil for a cheap work car! So, seeing this car likes oil a bit on the thicker side, 15w40 Delo 400 looks like a great oil for the price, even if consumption occurs. Would running this oil long term, say a few years, have any detrimental effects on a passenger car engine? I've read a bit on the Ash content being higher in this oil. Catalytic converters issues? etc.. Thanks!