Can the standard 290 HP V6 on the new generation Explorers take 5w30 oil? I saw the oil cap says 5W-20, but know a lot of times it is listed in the manual that other weights are acceptable (or acceptable if it is synthetic, which I'd use synthetic). Is there a certain standard (SN, or a Ford specific one like GM's Dexos 1) that the oil needs to meet?