[tjm]

you can switch back to conventional oil if you like at any time with no ill effects other than less protection.

I used regular mobil 1 in my olds 98 touring sedan and sold the car with 222,000 miles never burning oil. I have used regular mobile 1 in my Aurora since 43,000 miles and now with 197,000 i feel well protected. i always reset the DIC and just change it when it tells me to; usually around 7500 miles.

the extra protection is for peace of mind not to save money. i.e. if you lose your job and cant afford to change your oil then you know you are protected.

FYI my Aurora has ALWAYS used a little oil - usually 2 quarts between changes. i think half is used by the engine and the other half by misc leaks.