I drive a 2001 Alfa Romeo small wagon (Europe) with an LPG installation. I now have 10k miles on the oil, and am ready to change it, but, as with the last change, the oil looks practically new. Quite transparent. It is “part synthetic” and just a store brand. I suppose I’ll do the change anyway, but opinions?
Also, I wonder why more people aren’t going LPG. I’ve had it for four years with no issues whatever, and I save half on my cost per mile. In North America I suppose there is an availability issue. You can always drive on petrol - the original gas tank is still there, but I suppose installers are few and far between. In western Europe “Autogas” is still quite unpopular, even though we pay around double for gasoline here. There is still a false perception that LPG could damage the engine, and the industry is too small to mount a proper public awareness campaign. In certain countries like Turkey and Poland, where the price is held low by the government, adoption is much higher. Filling is a bit inconvenient compared to petrol, but not a big deal.