Just bought a superformance with a roush 327r in it...i want to change all the fluids and do some routine maintanance...the engine started life with with 20-50 dynosaur
oil in it and then after a time the previous owner changed to 10-30 conventional...question...?...should i be using 20-50 (or was that some kind of break in ritual) or the 10-30 and it has been using conventional
oil and can i switch to
synthetic since it is all the other cars...