Castrol TTS is not an ester based oil, it is also diluted with kerosene. Klotz Techniplate is not ester based. I've used KL-200 and I like it because of it's a high viscosity. I also have Klotz R-50 which seems very similar but has higher film strength, and is only for gasoline blending. Pe Reivers has a nice chart on his website. I have the same opinions about oils, though some simply aren't available in the US, and some of our oils aren't listed. http://www.mvvs.nl/MVVS/main_bestanden/petrol.htm#oils The best, and most expensive oils are the esters.