I thought my mechanic knew what he was doing until

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You're right. There is something about cars and maintenance that brings out the arrogance and testosterone of many people. People in the racing business are the worst!
 
As others have said, some people have a hard time simply admitting they made a mistake. Once you admit to a mistake you can get on with trying to make it right. Otherwise, you tend to just dig a deeper hole.

Mechanics, parts counter people and service writers often pretend to have far more knowledge about lubricants than they really do. The bad part is when they believe their own bulldinky.
 
The thing is, maybe this mechanic WILL learn and make up for his error.
This sort of compares to people who get tired of fixing their cars, and get rid of them. Then, someone else gets a nice fixed car!
Don't dump this guy until you have a sure thing alternative.
 
I will not tolerate his behavior, both as an pompous [censored] and a dishonest cheat. I tend not to hold on to these types of people regardless of how they can benefit me. As Jeff Lebowski (The Dude) stated...."This aggression will not stand, man."
 
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Originally Posted By: Kestas
You're right. There is something about cars and maintenance that brings out the arrogance and testosterone of many people. People in the racing business are the worst!


+1 A lot of them don't realize that it is more difficult to make a decent mass produced automobile than a "one off" racing machine.
 
Originally Posted By: mechtech2
The thing is, maybe this mechanic WILL learn and make up for his error.
This sort of compares to people who get tired of fixing their cars, and get rid of them. Then, someone else gets a nice fixed car!


Very true. I have bought 2 cars and one boat in that very situation. All 3 were lemons that the owner had less than 2 years and repaired multiple times. All gave me several years of trouble free operation with minor regular upkeep. The boat I bought for 1/2 of market price because the guy hated it. I used it for four years and sold it for more than I paid for it.
 
Originally Posted By: e55amgbenz007
It actually states that the MT-90 gear oil is not suitable for hypoid gear diffs on the Redline site! All data diy (the same site he uses) calls for a hypoid gear oil. I would assume that this indeed, is a hypoid gear differential. That would mean that the Redline cannot be used in my diffs. He should have absolutely known that. But aside from the mistake, he continues to justify his decision which makes me think that is indeed not as smart as I give him credit for.


give the guy a break, atleast he fixed what you wanted, nobody is perfect


and if you know so [censored] much about all this, how come you are not doing it yourself? The only way to be 100% sure everything is to your satisfaction is to do the job yourself....

I do everything on my car from oil changes, to tires, alignments, to engine swaps....... its a nice feeling knowing you keep it running yourself and don't rely on other people
 
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Originally Posted By: e55amgbenz007
he continues to justify his decision which makes me think that is indeed not as smart as I give him credit for.
The fast cars and all the as*-kissers gave him a big head and he thinks he knows it all now.
 
He did repeatedly say while attempting to justify his decision that Toyota uses or used to use GL-4 fluid in their diffs. I laughed and told him that he knows better. I had never, ever even thought of putting a MT-90 fluid in any of the Toyotas that I service.
 
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My 2 cents ...

- You don't really need to change his mind, just get him to change the oil to what you want.
- $40 of wasted fluid is a small loss as far as car maintenance goes. (The car is probably depreciating that much a week!)
- Decent mechanics (let alone excellent ones) are hard to find and they are always retiring. I wouldn't toss your relationship with one for less than theft.
- You can always do the work yourself. But realistically you will sometimes still be dissatisfied with the work, or the expense or the time the vehicle is out of service.
 
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If a mechanic can put the wrong fluid in purposely the first time, there's no guarantee what's in there now. This is just one example of why I change all my own fluids, and if someone else does it I'm right there beside them watching. There's no flexibility in that policy...ever!
 
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