Since I purchased my Mitsubishi TL over 4 years ago, and converted to dual fuel, I have not experienced any problem, I now use Penrite for all my lubricating needs, my car is purrrrrrrrrrring like a kitten. So am I,
thank you Penrite!!

Been using Penrites Gas10 since new, changing every 10k. Despite the dealers attempts to sow fear and uncertainty the result has been a reliable truck that hasnt had a problem and continues now in light family use.
Also use HPR 30 on older club permit cars with great results. I like to support a manufacturer that provides products for older machines (gearbox oils, shock absorber oil etc)

I've used HPR Gas 10 exclusively in my LPG BA Falcon for the past decade. I change the oil and the filter (Ryco) every 10,000km. The car now has 469,000km on it. It's been the most reliable car I've ever owned...except for the smegging front rotors which have to be machined/replaced once a year.