As the car gets to higher km's though 5w-30 is going to be too thin...
I don't see how the racing oil is missing anything? Have a look here;
http://www.penriteoil.com.au/engineo...d_products=277
It's full zinc, shear free, latest API rating (SN)....
Comparing it to penrite's "everyday" 10w-40 it is very similar in viscosity at both 40 and 100 degrees C, and has an identical amount of zinc...
The only difference they advertise between the "everyday" range and the "racing" range is that it is shear free (won't lose viscosity).....
So I don't know what it is missing? Maybe you can help.......




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