Help select oil for high mileage Grand Am

[ZiTS]

O.K. guys, need your advice (again....)

My wife's 2000 Grand Am GT (V-6) has 110,000 miles on it, and I'm trying to decide which oil to use:

Pennzoil Synthetic 5w30 ($5.19)
Valvoline MaxLife Synthetic 5w30 ($5.19)
Mobil Clean 7500 5w30 ($3.08)

It is just finishing up the rinse phase of another Auto-Rx treatment, and had been using GC for quite a while before that (at least two years). The engine doesn't burn, use, or leak any oil, and sees highway miles almost exclusively. I was very interested in the Synthetic MaxLife at first, but it is a little hard to find in my area, and seeing as how I could pay the same price for the Pennzoil (which I believe much closer to being a 'true' synthetic), I'm starting to think otherwise. Since it seems like the jury is still out on the new 0w30 Syntec, I decided to try something different. I like the fact that the Mobil blend is over $2 cheaper, and know that Mobil is a very good product. As a post script, I was planning on sticking to 5w30

 

[benjamming]

Have you had the intake manifold gasket go on you yet? Have you done any UOAs?

 

[BigDenCCMD]

If you have Advance Auto in Ohio you could try the Pennzoil Syn. They have a rebate of $15 for 6 qts. Rebate coupon reads that you can get rebate once a month. Still not sure if they mean calendar month or otherwise. Ends up being less than $3 a qt.

 

[BigDenCCMD]

Meant to also write that if you went the AA Pennzoil route you could try it for a few UOAs to see if it is worth extra $.

 

[TallPaul]

quote:

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Originally posted by ZiTS:
Mobil Clean 7500 5w30 ($3.08)

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On sale right now at Pep Boys for $1.99 a quart. See this thread. Same form also mentions a Pennzoil $15 gas card rebate.

 

[ZiTS]

quote:

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Originally posted by benjamming:
Have you had the intake manifold gasket go on you yet? Have you done any UOAs?

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Yes sir, I did. That was done just a couple years back after a UOA showed there was coolant leaking. I've also done several other UOA's (some of which are posted), and everything looks good. The car is pretty much in excellent shape, and that is why I want to go the synthetic route - it's paid for, and we will have it for a while yet.

Let's assume price isn't an issue; what oil would be best suited for this application?

 

[TallPaul]

You have listed three excellent oils and it is hard to pick between them. I am biased towards the Maxlife Synthetic though (also biased towards 10w30).