syn oil not good for older engines

[WilliamBos]

My 2 cents here..............Exactly 300 000 miles cane be and has been done with out syn oil. I am a firm believer in regular changes, and even more often for short distance city type driving. A good quality oil and filter and you are good to go!! But for those who run syn oil, all the power to you!!

Respectfully

Will

 

[Soundguy]

</font><font color="blue" class="small">( With the synthetics ie 5 w 40 , the base viscosity is 5 right )</font>

That's my take on it.


I don't like that extended run time thing either.. I want the crud outta my engine.. not circulating in there for 12000 miles. No filter is gonna pull ALL of it out.. that's what the oil change is for..

Also.. I'm unsure of the addative lifespan as well.. not sure if it is long chain polymer technology.. or somehting totally new...

If it were only a cost issue.. and it did 'blanket' help ALL engines.. I would deffinately do the regular oil change.. with the superior oil, even if only to cut down on 'start-up' wear..

Soundguy

 

[RichNJKubota]

I heard the same thing about oil/seal incompatibility. Over the years I have used many types of synthetic oil in both the engine and manual trans of cars from the 50's, 60's, 70's, etc.
Never a seal problem. Never any problem.

Rich

 

[1075]

I am not an expert on the subject, but I am a believe in using synthetics in my vehicles and equipment. One reason is the extra "cushion" they may provide if I go a few hundred miles over the recommended change interval.

Mainly it's because of my experience with what I interpret to be better cold weather flow and cold start up characteristics. This is based on my experience with different vehicles. I had a 88 Bronco II that used to have a noticibly noisy lifter on start up. You could actually hear when the oil got up in the engine, the lifter noise would stop after about 2-5 seconds depending on the outside temperature. When I changed to synthetic oil, that noise disappeared. Same thing happened when I changed tto synthetic in the transfer case and differentials. When I shifted "on the fly" into 4 wheel drive in cold temperatures there was a loud "clunk" as the 4WD engaged which also disappeared when I switched to synthetic.

To get back on topic, I use Mobil 1 synthetic in my '69 JD 110 with no problems and intend to use Delvac 1 in my X595 when I do the first oil change. As for the big debate on what is best, I guess the answer seems to be, whatever works best for your specific application.

Anybody want to discuss filters now? /forums/images/graemlins/grin.gif

 

[mahlers]

If you have a turbo - then using a synthetic provides a good safety margin if you aren't good about letting the turbo cool down after hard use. Dino oils will coke up in the bearings if you shut down too soon, and the synthetics hold together much better in these situations.

Even if they're overkill in most applications, I still use synthetics - and now that Rotella Synthetic is so darn cheap, the cost over dino oils isn't too much of a factor.

 

[jayhawkRoy]

Not sure if "base viscosity" is an accurate term. Here is SAE's definiton of a multi-vis oil, and they established the definition: "When oils are identified by more than one SAE viscosity number, the ''W'' number designates the viscosity at 0F and the higher number without additional symbol, designates the viscosity at 210F.'' So, 5W30's viscosity is 30 [weight] at 210 degrees and is 5 [weight] at zero degrees. The two numbers represent the oil's viscosity at two different temperature points: hot (210 F) and cold (0 F). If there is a "base viscosity", I would vote for the hot number, simply because that is pretty much normal operating temp for a vehicle. I view the numbers as capabilities (cold and hot) and not base numbers. I'm no expert, but that is the way I nterpret the numbers, as a non-technical/engineer type. Any of the petroleum engineers can certainly pipe up if I am misinterpreting anything!

 

[GoodGuy]

gsxr....
I'm not up on aircraft engines so I'm wondering do they use synthetic lubricants ??
Please Advise
Eric

 

[Gator6x4]

The following is from Mobil1 in regards to the question Mobil1 will leak out or damage the seals of older cars.

Will Mobil 1 will leak out or damage the seals of older cars?

"Mobil 1 does not cause leaks. In fact, new Mobil 1 with SuperSyn™ was tested in dozens of industry standard and OEM tests to prove its seal performance. It is fully compatible with the elastomeric materials from which all automotive seals and gaskets are made.

ExxonMobil engineers are wary of conventional oils that tout their use of additional seal-swelling agents. With extended use, these agents can over-soften engine seals, resulting in leaks. More to the point, an oil additive will not rejuvenate worn or damaged seals. The damaged seal may have been caused by a worn rotating metal component in the engine.

If an older engine is in good condition and does not have oil leaks, Mobil 1 with SuperSyn™ provides the same advantages as when used in a new engine. ExxonMobil recommends taking measures to repair the leaks, then using Mobil 1 with SuperSyn™. ExxonMobil also always recommends following the automobile manufacturer's manual for the proper oil to use."

 

[Soundguy]

</font><font color="blue" class="small">( The following is from Mobil1 in regards to the question Mobil1 will leak out or damage the seals of older cars. )</font>

I 've seen that faq. And I can still tell ya that the post I made was a direct quote from their email customer service.. not a quoted section from a faq.

I'm not drawing any conclusions here.. just stating what I see. The very fact that mobil is taking two different stances ( one in the faq.. and one from live customer service) should be a bit of an eye opener to the public about information availability in that ( or any ) company.

Soundguy

 

[KiotiJohn]

</font><font color="blue" class="small">( The very fact that mobil is taking two different stances ( one in the faq.. and one from live customer service) should be a bit of an eye opener to the public about information availability in that ( or any ) company.)</font>
I agree totally with you on that one Chris. Their published FAQ rather makes it policy, for liability purposes, but the e-mail may have been more to the fact. John