So, recently I was involved in a debate where the claim was that HVO100 was not approved and not allowed in the diesel engine A20DTx – the diesel engine available for both Saab and Opel. The claim is somewhat correct, but at the same time it’s still invalid. It’s true that Saab didn’t approve HVO100 – probably because the breakthrough of HVO100 comes after Saabs bankruptcy in December 2011. And Opel still being under the GM umbrella, GM that doesn’t really favor diesel as fuel since its an American company.   So, can you run your Saab A20DTH/DTR on HVO100?Short answer is yes, its no problem… But lets get into…