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Old 12-13-2005, 05:50 PM   #1
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Oil Ratings

I know there are many opinions on OIL. I noticed lately the price has really gone up. A 5 quart container is 12 dollars plus at Wally world, although Havoline and Quaker State are still around 7. I went out to Google and found a couple of charts rating oils, based on Viscosity Index, flash point, ash content, etc.
I was very surprised to see that Castrol and Valvoline which I have been using, are lower rated tha Quaker State and Havoline which are both still cheap.
alright guys- give me your opinions. I change my oil regularly, but right now I am looking at changing it on 4 vehicles. My AS is one of them.
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Old 12-13-2005, 06:11 PM   #2
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Run the grade of oil (or better) that is listed in your owners manual. More importantly ... get an oil analysis done. It is the best way to see how long you can go between changes and how well your engine is doing.

I use Blackstone Labs ... the info they provide has been invaluable to me.
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Old 12-13-2005, 06:19 PM   #3
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I've always changed my oil and filter every 3,000 miles regardless of manufacturer's recommendations. Also, I always use oil with the highest rating, i.e. SH, SG, etc. - whatever the latest S.A.E. ratings are at the time. In over 40 years I have never had an engine failure, nor damage to an engine related to oil. Obviously, that's not just because of changing oil, but I am absolutely convinced that brand of oil, as long as it's the highest S.A.E. rating, doesn't matter. It's frequency that makes the difference. Now, synthetic oils are a little different matter, but since the change interval needs to stay close I wouldn't spend the extra money. As far as rising prices are concerned, I've certainly noticed the same thing. My suspicion is that the same forces that have caused gas to go so high - not to mention propane - are causing oil to do the same . These are all opinions, of course, but I got them from my experiences with oils and engines.

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Old 12-13-2005, 06:51 PM   #4
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I use Havoline oil, synthetic in my tow vehicle, and organic in my other vehicles, in the weights specified for them. Usually that means 10W30, although the generator and lawn equipment use straight 30HD. I have had no oil-related issues in any of them.
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Old 12-13-2005, 07:32 PM   #5
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Read this if you want to know a little bit more about synthetic oils.
http://oilstudy.spacebears.com
They have real world tested Mobil1 and Amsoil. It's a long read, but well worth the time spent, in my opinion.
I had been running Amsoil and Mobil1 prior to reading this article. My Suburban is at 120kmiles, with 10kmile Oil change interval, running Amsoil.
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Old 12-13-2005, 07:37 PM   #6
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I run Castrol 0W30 synthetic in wife's car,(8000 mile OCI, per GM Oil Life Monitor) Cub Cadet lawn mower, Honda push mower, Honda generator, Generac generator, Briggs power washer. John Deere 2520 and 820 diesel tractors get Castrol Tection Extra 15W40 at 100 hour intervals. My Duramax diesel pickup gets Mobil 1 Truck and SUV at 7500 mile OCI's.

Everything you need to know about oil here: http://www.bobistheoilguy.com
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Old 12-13-2005, 07:57 PM   #7
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Amsoil rated highest, followed by a few other synths in the articles iread. What got me was that Quaker State was higher rated than Castrol and havoline, and Valvoline and Pennzoil.
I have always changed oil regularly and and never had an engine failure in 40 yrs of driving. I just wonder what the differneces are between perceived high rated products like Castrol, and the reality. It did say on a few writings, that oil if changed regularly - brand was not as important as frequency of change. and viscocity rating.
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Old 12-13-2005, 08:00 PM   #8
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I'm a Mobil 1 fan. Been running it for about 15 years. I started by putting it into a Bertone sports car I bought new in 1988. Car had about 80,000 miles when I switched from Castrol GTX 10w40 to Mobil 1 15w50. I noticed immediately that it idled more smoothly, revved better (up to 8300rpm without much trouble) and I got about 2mpg better on average with it. I got into the habit of changing the filter at 3,000 miles and the oil and filter at 6,000 miles. Mobil says it will go 15,000 miles between changes. I don't know. I think it's good stuff. I run it in several of my cars, all of which are over 150,000 miles and still going strong. Ran it in my Goldwing too and it worked great.

I think there is something to synthetic oils.
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Old 12-13-2005, 08:00 PM   #9
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Quote:
Originally Posted by ALANSD
It did say on a few writings, that oil if changed regularly - brand was not as important as frequency of change. and viscocity rating.
I agree with that, it seems to be about the number 2 abuse of vehicles, right behind not checking tire pressure. Cars and trucks come in with 6,000, 8,000 even 12,000 miles since the last oil change (conventional oil). And they wonder why the car makes funny noises...But don't get me started on lack on maintenance.
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Old 12-13-2005, 08:08 PM   #10
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Hi, Terry,

One thing I'm curious about... There's a common saying that synthetic oils are chemically incapable of forming sludge. Any thoughts about that?

Lamar
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Old 12-13-2005, 08:36 PM   #11
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Quote:
Originally Posted by SafeHarbor
Hi, Terry,

One thing I'm curious about... There's a common saying that synthetic oils are chemically incapable of forming sludge. Any thoughts about that?

Lamar
That is basically true, but there are still combustion byproducts that get into the oil. Over time, they will cause just as much sludge as the oil-formed sludge, after all, gasoline is made from the same thing as motor oil. It just takes a lot longer. Which is one reason why Amsoil works in 10,000 mile oil changes.
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Old 12-13-2005, 09:07 PM   #12
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o.k. how about synth transmisson and hypoid for the rear axle? What's our experience?
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Old 12-13-2005, 11:06 PM   #13
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Quote:
Originally Posted by GlenCoombe
o.k. how about synth transmisson and hypoid for the rear axle? What's our experience?
I've been running Amsoil Torque-Drive synthetic ATF in the Allison auto trans in my '01 2500hd after changing factory fill at 40,242 miles. The trans filter was changed at 25,925 then at 40,242 with the Torque-Drive. I now have 49,341 miles with no problems.

The rear diff. was drained at 8,816 miles, a Mag-Hytec rear diff. cover was added and Amsoil Series 2000 75W-90 synthetic gear lube was added. This was drained at 40,242 miles and Amsoil Severe Gear 75W-90 added.

I ran Amsoil 5W30 synthetic for my first engine oil change at 2,816 miles and every 4,000 miles up to 30,610 where I changed to the Amsoil dual bypass oil filtration system (2 filters). I now run 4,000-5,000 miles, change the Amsoil SDF full flow filter, put in a qt. Amsoil 5W-30 and go another 4,000-5,000 miles then change both filters and add new oil.

Synthetic will also go into my transfer case and front differential at the beginning of summer.
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Old 12-14-2005, 06:27 AM   #14
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Quote:
Originally Posted by GlenCoombe
o.k. how about synth transmisson and hypoid for the rear axle? What's our experience?
Mine has been very good. I used synthetic ATF and gear lube in the Dakota, and use synthetic gear lube in our tow vehicle. Synthetic gear lube is now specified in many rear diff applications. It will withstand higher temps without breaking down, and causing a lubricant-related failure. Even the most expensive stuff, at around $12/qt, will usually mean no more than a $40 bill to change the fluid.
MoHo's of course would be more, since they hold more fluid.
My personal experience with synthetic ATF was cut short due to an unrelated failure in my previous tow vehicle, but I have several friends that have modified their engines, and are using synthetic ATF, with good results, again, no ATF discoloration, and no ATF-related failures. The only caveat for all the synthetic stuff, is that since it flows so much more freely, any minor leak can become a major hemmorrage.
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