I noticed that the coolant level for the battery in my roadster was low. Apart from checking whether there is a leak in the system, I need to top off the system in the mean time. I looked in the Owner's Manual and found that Havoline Extended Life antifreeze Coolant-PG (XLC-PG) is recommended. In looking around at stores and online I was unable to locate this product. There was mention in Lotus forums that XLC-PG is equivalent to DEX-Cool, but DEX-Cool is normally orange colored coolant and my roadster's coolant is definitely yellow. What are you using for coolant - is there a reason the manual calls out XLC-PG specifically? Sorry if this has been previously posted, I did some searching and didn't find anything. - - - Updated - - - When I posted, a related thread popped up: Hello, new to the forum, quick coolant question. Is this NAPA coolant OK to use in the 2008 roadster? This product looks like propylene glycol instead of ethylene glycol - I'm guessing that is what the "PG" in XLC-PG means.