Synthetic Oil

M

metload1

New member
Hey,



Is it true that once you put synthetic oil in your car, you can never put regular back into it? Even when getting your oil changed?



Thanks!
 
I believe there are more myths:



Synthetic is so slick, it will go through your piston rings if you use it after 3000 miles.





You cant use synthetic if you have used regular oil for longer than the break-in period.





A 60k+ mile engine will die with synthetic in it.





There are a lot of stories. I use only Mobil 1 and have for 15+ years. Good or not, I feel good. I have cases of it in my garage, I bring it to my oil changes. Along with Sunoco 94 octane fuel. For the few extra bucks, who cares!
 
Yup, it's a myth. Have you ever noticed "Synthetic Blend" oils on the shelf with the dino and synthetic stuff? If they can mix it in a bottle, there's no reason why changing back and forth in the engine would harm anything.
 
It's a myth, although I wouldn't be switching back and forth. I've been using Lubro Moly and then Elf synthetics in my turbo Volvo for over a decade and she has always been running great. Regular changes are still key, I usually do so well before it's recommended (6000 kms on average).
 
yup those are myths. at rx7club some of us believe that we shouldnt run synthetic oils in rotary engines but the truth is that you should never run craptastic synthetic oils, so its ok if you go for the big brands like Mobile 1.
 
meh i got this though lol.. though its written by a respected rx7club admin... and it applies for rotary engines lol...



"Can I use synthetic oils in my Rotary engined car?

Yes and no. Mazda offically does not recommend the use of synthetic oils in rotary engines, however, long term and racing use has shown that the better synthetics (Redline, Amsoil, Neo, Royal Purple, Mobil1) are perfectly fine to use in a rotary engine, and will generally result in a 1 to 2% horsepower gain. However use of poor quality synthetics (like Valvoline, Castrol Syntec, Havoline, Etc) will result in build up due to high ash content left from these oils when they are burned. It is believed that is why Mazda did not recommend synthetics, because the couldn't pick favorites."
 
Why go back to dino when sythetic is a lot better, need proof that you can go longer during oil changes?? Then here you go http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=3;t=003511

**Take note this oil sample has approx 10 hrs of me moving from south Fl (near the Keys) to SC (80-90 mph) and two trips back to central FL (6 hrs each way; 80-90 mph). Add to that some "spirited" local driving, and they want me to go 6,000 miles for my next oil change** Cost of each oil change $14 using Motorcraft 10w30 sythetic blend ($2.07 each@wallyWorld) and Motocraft Fl1a oil filter($3.xx) that only $28 a year ;)
 
another qx4 said:
meh i got this though lol.. though its written by a respected rx7club admin... and it applies for rotary engines lol...



"Can I use synthetic oils in my Rotary engined car?

Yes and no. Mazda offically does not recommend the use of synthetic oils in rotary engines, however, long term and racing use has shown that the better synthetics (Redline, Amsoil, Neo, Royal Purple, Mobil1) are perfectly fine to use in a rotary engine, and will generally result in a 1 to 2% horsepower gain. However use of poor quality synthetics (like Valvoline, Castrol Syntec, Havoline, Etc) will result in build up due to high ash content left from these oils when they are burned. It is believed that is why Mazda did not recommend synthetics, because the couldn't pick favorites."
Click to expand...





I would take that with a Grain of salt, some of the brands this expert labels as low quality test as the best all around lubricants you can buy.



Dont trust me, read the facts and see the oil analysys reports for yourself



bobistheoilguy.com



Castrol (Made in Germany) has a cult following, people hoard the stuff, the test results on the other brands are also very impressive. I doubt you could find a bad synthetic oil out there today, or in the past for that matter.



Im an aircraft mechanic, but my knowledge of oil pales in comparison to the people on the forums of Bobistheoilguy.com. These are some serious enthusiasts and even some product engineers.



Of course all this means nothing since your car will be dead long before any oil related problem arises. Most cars today are driven to the junkyard.



I would seriously question the person you quoted for info, its pretty clear he doesnt know much about the subject, no offense but I would think twice before I took any more advice from him.



Don't take that the wrong way, you can see for yourself, if you do the research, he is far from an expert.



I would love to use Amsoil, as soon as they submit it for testing I will, instead they sell it via multi level marketing schemes and spread false info about the competition plus making outrageous claims about the benifits of the oil, its oil, thats all it is. This alone makes me run the other way, and it may be a great product that is just poorly marketed. Just my opinion
 
FalconGuy said:
I would take that with a Grain of salt, some of the brands this expert labels as low quality test as the best all around lubricants you can buy.
Click to expand...



One reoccuring thing about synthetic oils that I constantly read are those poor quality synthetics (Valvoline, Pennzoil, Castrol Syntec, etc.) are Group 3 oils which is a blend. Apparently only Group 4 and 5 oils are "true" synthetics. Not sure how "true" this is because I have no empirical evidence to back it up, it's just something that I've read on quite a few different forums.
 
I thought I just chime in on the discussion and repeat what's been said, what seems to be like a thousand times, Its a myth. :p
 
JohnnyDaJackal said:
One reoccuring thing about synthetic oils that I constantly read are those poor quality synthetics (Valvoline, Pennzoil, Castrol Syntec, etc.) are Group 3 oils which is a blend. Apparently only Group 4 and 5 oils are "true" synthetics. Not sure how "true" this is because I have no empirical evidence to back it up, it's just something that I've read on quite a few different forums.
Click to expand...





That is correct. Mobil sued Castrol concerning the synthetic labeling. Castrol won the suit eventually even though its Syntec is not a group IV or V. GC or German Castrol is a group IV and has a strong following.



It doesn't mean that group III are poor oils at all, they're not. The gripe is that they normally sell for the same price as Grp IV & V oils that cost more to produce.



Member 415 on Bobistheoilguy.
 
You can swith, like everyone has already said. I run Mobil 1 in my engine and here is why. A friedn of mine used to own a perfromance shop and I was there one day when they pulled the motor of a Civic with almost 200,000 miles on it. They tore the engine down and the inside of the motor sparkled it was so clean. It was because the owner ran synthetic from day one.
 
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