If you use Penrite's MC-4ST 10W40 oil in your ST you may find this of interest...
Supercheap Auto wants $101.00...
But, you can get this oil for
$63.74 from the
Automotive Superstore.There's free shipping if you spend $99 or more.
I ordered 2 bottles...
https://automotivesuperstore.com.au/penrite-mc4full10004