- Jun 5, 2003
- Apple Valley, California
02 Wrangler 4.0 I'm almost due for an oil change. I have a case of SJ Havoline SAE30. It was 85F @ 8am this morning and now it's 98F. It will only get hotter untill Sept. July and August won't drop below 105F at night and daytime will be 115F-120F. The 3yr/36k warranty is over so thats not a valid reason not to use the stuff.