professorD

but Penrite Red contains silicates (potential seal damage Toyota video) and is Si-OAT not Hybrid OAT (manual notes) non-silicate, non-amine, non-nitrate non-borate it does meet TSK2601G so what do you believe https://www.penriteoil.com.au/assets/pdf/tech/Nov2015/Coolants.pdfhttps://www.penriteoil.com.au/assets/pdf/tech/Nov2015/Coolants.pdf