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Originally Posted by mrbass
I want to bought the oem black air box and replace the AEM short ram intake because in a forum I read that its better the black air box for FE.
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Yes, RAM intake isn't very helpful for FE from what I've read around here. Many users here would actually recommend adding a warm air intake as opposed to CAI for FE purposes. Warmer air causes the engine mixture to run leaner, which leads to less fuel usage, I believe is the theory behind it.
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in my city the temp its about 100-120 F. So i think that in July I will put a 10w40 or 50 synthetic oil.
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As long as you're using synthetic, I'd keep it at 10w30 (or whatever the lowest manufacturer recommended is). Synthetic oil is more durable in extreme temperatures than standard oil.