Hi, my friends 91' VR-4 has 135,000 miles on it and he ran nothing but Mobil 1 10W-30 with an OCI of 3,000 all the time. His engine is souped up to about 450hps. His car smokes alittle at startup and says burns alittle bit of oil at full throttle. I was wondering if it's worth considering an Auto-RX treatment or would that not do any good for the valve seals or whatever is causing the puff at startup?? Also is there a better oil to use than what he is using now? Thanks guys for your expertise
