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Old 07-17-2005, 08:16 AM   #29
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another vote for Mobil 1

I converted to Mobil 1 on the third oil change on the 2005 2500 Burb. I use Chevy's oil change "gage" to guide my changes.
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Old 07-17-2005, 12:05 PM   #30
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The best oil is a freshly changed one...

I use Chevron Delo 400 15w40 or whatever heavy-duty diesel truck oil I can find, also 15w40.

I use the best filter I can find, NAPA gold, extended size. More oil. Or Purolator Pure one.

This is in 7.5L towing vehicle. It's not new to say the least, so I don't think it warrants synthetic. On the other hand, if my TV was under 5 years old - and I drove it more than 5K miles /year, I think I would use synthetic.
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Old 07-17-2005, 12:58 PM   #31
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Originally Posted by 16595
I have switched all vehicles to Mobil 1, based to a fair extent on the following study: http://neptune.spacebears.com/cars/s.../oil-life.html

I feel that the synthetic will provide a cooler running engine which is pretty important in a tow vehicle. The above study seemed to favor the Mobil 1 over the Amsoil, in part because Amsoil seemed to develop a higher viscosity with age.

I expect I will switch the Suburban to syn trans fluid soon. Any comments? What brand do other use? I haven't seen Mobil 1 trans fluid.

My change intervals have been in the 8-10,000 range. If the mfgr says 7,500 I expect that is conservative in their view. The study says it almost never needs changing IF some makeup oil is added due to filter change. My '91 Cad uses a little oil and the suburban very little. I do a filter change at 5,000 and then change oil at 10,000.

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So just add 0W-30 to offset the thickened viscosity as the oil get older. You can't dismiss the fact that the Amsoil showed less wear in the engine in this study. That is what I would be interested in. I use the dual bypass system, change full flow filter at 5,000 miles, add a qt. of 5W-30, then change both filters and oil at the 10,000 mile mark. Always seemed to work for me.
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Old 07-18-2005, 09:23 PM   #32
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Your bypass filter the onr that use TP in it? I have seen it used. thay said it works. I don't know, I have heve used it.
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Old 07-18-2005, 09:31 PM   #33
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Quote:
So just add 0W-30 to offset the thickened viscosity as the oil get older.
0W30 is just as thick as 5W30, 10W30 and straight SAE 30W oil at 100 deg C. The number before the "W" denotes viscosity below something like -20 F. Oil is never "thin enough" at startup on a cold engine.
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Old 07-19-2005, 02:43 PM   #34
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The best oil is a freshly changed one...

The study noted above seems to question this, as they found the greatest increase of suspended metals in the first couple thousand miles after an oil change. Check the study for a more accurate report than I remember here.

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Old 07-19-2005, 04:36 PM   #35
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Quote:
Originally Posted by 16595
The best oil is a freshly changed one...

The study noted above seems to question this, as they found the greatest increase of suspended metals in the first couple thousand miles after an oil change. Check the study for a more accurate report than I remember here.

Dwight
I'd say that the detergents in these oils are probably most active during the first few thousand miles.
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