When I first bought my 54 3100 with a stock 235 I took it to have the new tires put on. While it was on the rack I asked them to change the oil. It wasn't until after the oil change I found out they used only synthetic oil, they didn't even stock regular oil. At first, I panicked. What was this going to my engine. I researched the myths and became cautiously optimistic. A year later and no issues. I can't tell any difference in comparison to regular oil.
