In the sonata manual book, it has a normal condition timeline for oil change intervals and a severe condition oil change intervals. I live in Texas DFW and it gets oven like here too. The dealer said in Texas, we should use the severe condition oil change intervals which is more often than normal condition to keep the engine from broken down oil. With Hyundai warranty, I'd be scared using any other oil. But that's me. Since we got the sonata, we've always taking it to the dealer for every thing like oil change, alignment and whatnots. But I am sure others here have already used their own preference in oil and gotten same results as dealer oil. And you are right, seems like most people here are always in snow lol
I've never heard of an oil keeping the engine temps lower. I've heard of radiator fluid additive to keep engine cooler. I don't know if those oil products you are talking about are going to be friendly to the turbo. I don't know much about turbo and if they are picky about certain oils or not .
man I guess I got confused when I saw royal purple.
I thought about the same thing. I don't see how coolant additives can effect anything other than temp. I'd try it.
as long as it says it'll be safe. German cars like my mom's passat uses a red color radiator fluid and read somewhere not to add it in other vehicles. I didn't know why and thought it was dumb. so I added it to my 93 accord thinking nothing about it. a few months later I noticed there was something foaming from a few joints in the radiator hoses. I did some research and found out that that's what happens if you add german radiator fluid in a vehicle that doesn't need it.
The gauge on the dash doesn't move until its at a level that isn't normal. 200 I would consider normal because during the summer on real hot days you'll probably hit that at every stop light. My grand am dash reading only moved when it got to I think 240. And it would blink a red light at 290. Let's just say I got rid of that car REAL fast.