TO ALL THE VERY KNOWLEDGEABLE RV TECH OUT THERE. I HAVE A QUESTION TO ASK. I bought my 2003 FleetwoodMH last Nov.it is an 8.1 gas. I now looking at changing the oil, but I really am confused on what type I should use. As of now I use GTX Castor oil in all my other vehicle, but was wanting to know if I can use the samein the MH. Right now it has just over 16,000. I would like to keep it for a long time without any motor problems, so the cost of the oil and filter isn't an option only the best will do. thanks foryour input.