That 10-40 everyday Shiite has been out for a while. Used it a couple of times in an sr20, seemed OK. I ended up changing to castrol edge 10-60 to try and stop my flogged sr from making its ugly sr noises. I don't have an sr anymore. I'm now an rb fan. I've got about 15 litres of 10-60 stockpiled in my shed. I'm wondering if it will be OK to run in the rb25?