Hi, I have just added about 20L before reading your reply. I drove it about 5 miles and it seemed fine if anything a little peakier. I will mix the rest with the bio I already have so should have about 150L. I have just found new cooking oil for sale locally for 14.99 for 25L so I may try adding that to make my own blend lol. Anything to save me paying £1.40 a litre is good.