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Old 08-16-2011, 05:51 PM   #16
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Again, we see lab data versus real life experience, and the two are not always in agreement.

And honestly, there is really NO WAY to do an apples-to-apples comparison, because everybody's driving experience is different. Period.


No matter what lab data says regarding synthetic versus dino oil performance, synthetic oil WILL perform better in extreme temperatures. 10W-30 synthetic oil WILL allow engines to turn over and start better in extreme cold, than will 10W-30 dino oil.

As far as synthetic versus dino oil in extreme heat, my experience is pretty simple. For several years, we had to replace at least one engine per summer in our lawn-mowing business. I started adding Lucas Synthetic Oil Stabilizer, and never replaced an engine after that. In fact now, 7 years after we stopped the lawn-mowing business, I'm still running one of the mowers. Everything has been rebuilt but the engine.

This may be anecdotal and circumstantial, but in my book buying a $12 bottle of synthetic oil additive is a heckuva lot cheaper than replacing a $1500 Kohler or Kawasaki engine every year. I'll stick with the former.


Regarding cars & pickups, everyone has their own legitimate opinion. As I said in another thread, I just sold a perfectly-running VW Golf with over 350,000 miles. In the 10 years I drove the car, I always ran either synthetic oil, or added the Lucas Synthetic Oil Stabilizer. I may very well have had the exact same results without ever using anything synthetic, but it's kind of hard to discount the results themselves.

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Old 08-16-2011, 06:13 PM   #17
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No matter what lab data says regarding synthetic versus dino oil performance, synthetic oil WILL perform better in extreme temperatures. 10W-30 synthetic oil WILL allow engines to turn over and start better in extreme cold, than will 10W-30 dino oil.

.
Both of those oils of the exact same weight will have the exact same drag on an engine. It will take the same amount of torque to turn it over.
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Old 08-16-2011, 06:20 PM   #18
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Both of those oils of the exact same weight will have the exact same drag on an engine. It will take the same amount of torque to turn it over.
In theory, yes. In real life, no. That's the weird thing about it.

Had you, like me, lived in Minnesota for nearly 20 years, you would have experienced the difference. 30 below zero, with wind, is a whole lot different than 30 degrees above zero.

All other things being equal, in extreme cold, the engine with the same weight synthetic oil in it will turn over much easier than the engine with dino oil. I cannot explain, using big words, all the reasons why. But I know for a fact that it works that way.
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Old 08-16-2011, 06:23 PM   #19
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Both of those oils of the exact same weight will have the exact same drag on an engine. It will take the same amount of torque to turn it over.
Thats' not exactly true. The pump-ability of the oil is the first number. So at 40C they are pretty much the same. But once you get the oil down to the single digits or negative F then the synthetic typically will flow easier than the conventional. Also, on the other end of the spectrum, if you overheat the oil, the dino oil will shear down to nothing while the synthetic will continue to lubricate. If you're intested look at the product data sheets for the various oils. synthetic always has a lower pour point than dino.
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Old 08-16-2011, 06:51 PM   #20
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I cannot verify this as factually true, but I've read (in several places) that all jet engines run synthetic oil, simply because conventional oils will not stand up to the extreme conditions.

Does anybody know whether this is factually true or not?
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Old 08-16-2011, 07:40 PM   #21
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Another one you're not going to believe but it's fact, GM does not specifiy synthetic in the Corvette- it RECOMMENDS it and even goes so far as to recommend Mobil One. It's a business deal, nothing more. Mobil provides GM with free oil fill caps for the advertising. Kinda like Ford F150 with the BP recommended gas label on the gas cap- it's a business deal. When GM did the deal, M1 was a mostly Gp IV (PAO) base oil. Since they lost their plant when Katrina hit, it's now a Gp III dino oil. They call their Gp III base oil VisCom FYI. But if GM specified Mobil One in it's owners manual, it would be obligated by law to furnish it to the user for free. There's a BIG difference between a recommendation and a specification.And if you just like controversy, research the new GM Dexos. Even the Feds are calling foul on this one. It's meaningless crap that's meant to drain oil companies of royalty rights money, nothing more. In their own manuals they state that if you can't find a Dexos oil, use any 5w-30- now that's an elevated spec!
Actually, the manuals state to use an oil that meets or exceeds GM4718M specification. GM has a published list that shows the oils they certify meet this spec. Every one of them is synthetic. Since the online list hasn't been updated since 2008, I went and looked at two different stores. Not one conventional oil states it meets anything higher the GM6094M. Do they? Maybe, but most likely not. The manufacturers won't put it on the bottle and I sure wouldn't want to provide those receipts to a dealer for oil changes that don't meet the stated spec.

I appreciate your vigor, but I just don't buy it. There is more to these specs than just clever marketing. Kendall at one point even stated their synthetic did not meet GM spec. It does now, but other synthetics don't and no conventional that I have found do.

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Old 08-17-2011, 06:50 AM   #22
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Well if we all take this down to base level, Glenlivet 18 Scotch ($63.00) is supposed to be far superior to Glenlivet 12. ($41.00) In my opinion, there is not much difference in taste, both get the job done, and I save close to twenty dollars. Both are VERY good in cold weather starts I must say.

This thread is like discussing religion and politics...good points on both sides...the differences are miniscule.....and no one changes their minds.
Interesting reading.
Have a good day, folks.
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Old 08-17-2011, 11:15 AM   #23
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This thread is like discussing religion and politics...good points on both sides...the differences are miniscule.....and no one changes their minds.
Interesting reading.
Have a good day, folks.
So true...
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"My dad used Quaker State so I use Quaker State" is hard reasoning to break.

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