Opionons wanted: Synthetic Oil Life - Page 2 - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #11 of 14 (permalink) Old 07-09-2013, 05:13 PM
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I've been running Amsoil since my car was new. I change the oil and filter once a year (about 20,000 miles annually). Car has 186,xxx miles on it and never had an oil related problem. I've had several cars over the past 15 years go well over 100,000 miles with the same change interval and never had an oil related issue.

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post #12 of 14 (permalink) Old 07-18-2013, 08:39 PM
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I do 5K oil changes with Mobil1 0W-20 with dealer-bought filters and crush rings. I actually hand deliver the filter plus the oil to my mechanic and he charges me $30, which is fine as I'm too busy and too old to want to do it any more, but I know it's still done right. So it still costs me under $70 for an oil change ($30 oil (Walmart), $8filter + crush ring, $30 labor). If Mobil is right and I get 2% better gas mileage with their oil, that brings my cost down to well under $50 per change with the additional gas savings. I put less than 10K miles on my car a year, so it's less than $100 for both oil changes annually which at my age is just great knowing I'm using the right stuff all the time.

Now if you want really, really, clean oil you might be able to do it this way that I learned by accident almost 30 years ago. I had a Toyota MR2 and it had a side mounted oil filter that always dumped oil down the side of the block and pan when i removed it. One night I was changing the oil and i got the idea to just let it drain all night and perhaps there would be less oil left in the filter when I unscrewed it the next day. To my surprise, when I unscrewed the filter it was BONE DRY the next day. I changed the oil and was even MORE SURPRISED to find that my oil stayed wickedly clean on the dip stick throughout the entire oil cycle. It never got dark at all! My guess is that if your engine design lends itself to complete drainage over a 24 hour timeframe, you will be pleased with draining the oil over a longer period if you can afford that luxury.
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post #13 of 14 (permalink) Old 07-22-2013, 11:58 AM
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I run 7,500 and did a Blackstone used oil report. It said everything was fine, sodium was a bit high (unknown - could be coolant leak but there is no coolant leak), and to try 9,000 miles next time. I use Mobil 1 5w-20 with Mobil 1 oil filter.
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post #14 of 14 (permalink) Old 08-17-2013, 02:06 AM
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Quote:
Originally Posted by Freak4Dell View Post
Personally, I wouldn't do 20,000 with any type of oil. I change mine at 5000K regardless of whether I use synthetic or the shop uses a blend. It comes out way to dark for me to even think about keeping it in there for 4x that.
You do know the color has absolutely nothing to do with the quality of the oil?
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