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I just hit 100K over the weekend, and I was planning on getting the oil changed this week, but I'm wondering what would be the best oil (brand/weight) for the job?

 
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Valvoline Max Life, 5w20 or 5w30.

5 wt% moly (highest of the common oils)
22 wt% synthetic

Best oil around for the price. Since you have a few more miles on your car, your engine rings and all that are nicely broke in, you can go to a little heavier oil in the warm temp region, so 5w30 would be fine. 5w20 still isn't a bad choice, keep in mind that if you do a lot of highway driving (which I guess you do since you have 100k already) 5w20 will give slightly better MPG than 5w30, we're talking maybe 0.5-1 highway MPG better.

 
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do they sell valvoline max liife '5w20' at places like pepboys, autozone, or kragens too? I see 5-30's but haven't checked for 5w20 maxlives yet.

 
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Not sure, I thought I saw 5w20 at Wal-Mart though, I could be wrong though.

 
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I'll have to grab some max-life this weekend, thanks Jrfish007.

 
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your original post makes it sound like you haven't changed the oil yet.

 
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yeah, I want some of that 100k oil, must be really pricey.

Does it increase your hp by like 300hp as well? That would be awesome if it did.

 
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that's what I thought too.

 
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I'll be at 103K by the end of next week, Lots of gas and lots of miles, but still runs like a champ.

 
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Whatever you've been using to get you to 100,000 miles will get you to 200,000 miles, don't change a thing. Assuming you change your oil regularly of course.