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Message: [QUOTE="superduty4x4, post: 1526082, member: 542"] My truck is due for an oil change and I'm trying to decide what I want to do. Currently has 15w40 dino oil in it, it's been running fine but she isn't a DD, I don't have convenient power where I park the truck, and I don't always know when I'm going to need to drive it so plugging it in may or may not even work. On a cold start it will usually romp/cackle very slightly for up to maybe 30 seconds tops, then it smooths out and all is well. What would be in the best interest of the truck to aid in the cold starts and reduce wear/damage to the sensitive injectors- 5w40 synthetic oil or an additive? From what I have been able to find either way will end up costing about the same since it seems the added expense of going to a synthetic oil is about the same cost as a good additive. Motor is stock, completely stock (yes even exhaust) and running PHP tunes on an insight pro. [/QUOTE]

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