you can go back, use a mix of both, doesnt matter...
The low oil was not from changing the oil. It was from not checking the fluid levels, which a lot of people are guilty of.Friend of mine was bragging he has not changed his oil in 30,000 miles and it looks brand new. I was sold, went out spent a small fortune on oil. I changed it at about six in the morning and by noon the next day I had hardly any oil left. That was maybe 20 years ago and I have stayed away from synthetic ever since.
People do not realize that it was Germany and Japan who created Bio-Diesel and Synthetic oils during WWII. Synthetics have been around since WWII, when all countries had to look at alternative oil and fuel sources, if they were not able to keep a supply coming in.Synthetic oil is great stuff. It's my understanding the oil itself lasts a very long time and really it's the filter that ends up needing changed first.
A lot of cars that come from the factory with synthetic have recommended maintenance intervals of 10,000 miles or more.
That is actually false. Synthetic blends allow an engine to be able to not burn off the oil at high temps. It has nothing to do with how fast oil leaks if a seal goes.You can go back.
The bigger issue is usually if you are running conventional and switch to synthetic after a while. If you have a leak with conventional oil, it will gush worse with synthetic.
While you can run longer intervals on synthetics if the base numbers and additive packages are correct, the filtration of the oil isn't the limiting factor in many cases.Synthetic oil is great stuff. It's my understanding the oil itself lasts a very long time and really it's the filter that ends up needing changed first.
A lot of cars that come from the factory with synthetic have recommended maintenance intervals of 10,000 miles or more.
Synthetic oils do, on average, have higher TFout numbers which limits their burn off and volatilization, however, I was speaking more to leaks at rubber seals and other gasket surfaces and not any consumable aspect of the oil.That is actually false. Synthetic blends allow an engine to be able to not burn off the oil at high temps. It has nothing to do with how fast oil leaks if a seal goes.
Japan and Germany perfected the use of Synthetic Oils during WWII. Over time, Synthetic blends have gotten better, that they are now able to save on how much recycled conventional oil and refined crude's for oils.
So much "professional mechanic" bunk out there, especially when trying to impress a woman (assuming of course that the mech was a guy....)Thanks. The whole reason for this topic is about my daughter's car. She bought a used 2006 Corolla from a dealer, along with some free oil changes. They used a synthetic blend oil, and they told her she couldn't go back to conventional oil. The free oil changes are used up, and she was asking me about this.
It sounds like the dealer lied to her. What a shock !!
Lets give him the benefit of the doubt. There is so much mis-information out there. Could be he actually believes this because "a guy told him", or because he "read it on the internet". Or he once knew a guy who switched from synthetic to conventional and the next day his engine blew up - so that proves you can't do it. For that matter, was this the chief mechanic at the dealership or a "service advisor"? Bet if you asked him how he came to that conclusion, he wouldn't have a good answer.It sounds like the dealer lied to her. What a shock !!