I currently have 10/40 semi in the spider 2.0 TS. Now then, I have read about possible advantages of using 5/40 fully synthetic.
I need to top up.(Not change).
By introducing slowly 5/40 fully synth. Will I be ok with the balance of chemistry by mixing the 2 oils and in your own opinions will the car prefer the 5/40 full synth to the 10/40 semi synth.