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Old 04-27-2001, 03:41 PM
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Join Date: Apr 2001
Location: Oakland
Posts: 24
Hey folks, it's about time to change my oil and I wanted to know if I should use a synthetic oil or not?
What weight?
The car has 165000 miles on it and it runs so sweet.
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Old 04-27-2001, 03:46 PM
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
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I can feel a flame war!!

I think the best thing for you to use would be Mobil 1, synthetic. You should do a search on this. There have been MANY topics covering this. You will learn a lot of valuable information and be able to decide for yourself which oil is best for you.
What kind of climate are you in? I use 20W 50, but it never goes below 40 F here! If it goes below 23 F, then you should use something lower than 20W. Good luck and don't forget the search!
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Old 04-27-2001, 05:30 PM
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Join Date: Jan 2001
Location: NY(work)/NJ(live)
Posts: 12
In your owners manual there is an extensive list of recommended oils. I'll fax mine to you if you don't have it. I have a 91 560 SEL 97K miles. It "uses" more w/ Mobil 1 0w-30 than Penzoil 5w-30( lazy in the winter, Jiffylubed ).

There's a big oil thread going on ...again. I change Mobil 1
every eight weeks, not that I need to, Just because I can.

Hope your's stay's tight!!
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Old 04-28-2001, 01:08 AM
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Join Date: Nov 2000
Location: Vernon, CT
Posts: 1,846
What weight to use is based on expected outside temp. I have seen some owner's manuals saying not to use 5W-30 if it's 60 F or higher and not to use it on long highway trips during the summer months. I don't remember what car it was for, but this just goes to show it is based on the car and climate. For my car, the owner's manual say a good year-round oil would be 10W-40 or 50. It's good from -4F to 86F. Currently I have 15W-40 in it, which per the graph in the manual, is good from 32F-86F.
Now as far as the old syn. vs. dino. question, like Jim said there is currently thread on this subject. Among gasoline owners, Mobil 1 seem to be the most popular for synthetic oil. For diesel owners using synthetic, it's either Mobil 1, or Mobil 1 Delvac.
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