Wrong engine oil grade used by dealer - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 52 (permalink) Old 10-27-2018, 09:58 PM Thread Starter
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Wrong engine oil grade used by dealer

I am an owner for 2018 Mazda 6 Grand Touring Reserve, 2.5 turbo for six months. I went to the dealer for an oil change today. Though I specifically asked the dealer to use 5W30 which is required for the turbo engine, they still used 0W20 which is only good for the NA engine and claimed it'd run fine for the turbo engine.

I don't buy it as 0W20 is too thin and don't know why they don't stick to the manufacturers recommendation. I've filed a complaint to Mazda USA and will see how things fall out. Need some opinion on whether I should drive the car next couple of days. I fear oil consumption would come up.
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post #2 of 52 (permalink) Old 10-27-2018, 11:10 PM
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It's not going to hurt your engine in the short term. Did the dealer flat out refuse to drain it and put in the correct oil?

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post #3 of 52 (permalink) Old 10-28-2018, 02:45 AM
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Quote:
Originally Posted by leecod View Post
I am an owner for 2018 Mazda 6 Grand Touring Reserve, 2.5 turbo for six months. I went to the dealer for an oil change today. Though I specifically asked the dealer to use 5W30 which is required for the turbo engine, they still used 0W20 which is only good for the NA engine and claimed it'd run fine for the turbo engine.

I don't buy it as 0W20 is too thin and don't know why they don't stick to the manufacturers recommendation. I've filed a complaint to Mazda USA and will see how things fall out. Need some opinion on whether I should drive the car next couple of days. I fear oil consumption would come up.

If the manual for the turbo states 5w30 then I would insist that they use the correct oil, even if that means they drain/fill what they just did.

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post #4 of 52 (permalink) Old 10-28-2018, 12:25 PM Thread Starter
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The service advisor said they don't have 5W30 after the oil change when I found out they used the wrong grade. Will contact them on Monday when their service manager is in.
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post #5 of 52 (permalink) Old 10-28-2018, 01:54 PM
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It's safe to drive, but I'd definitely follow up with the dealer and Mazda.


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post #6 of 52 (permalink) Old 10-28-2018, 03:19 PM
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Question how did you or how does one know what oil grade a dealership uses?

(Other than ask)
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post #7 of 52 (permalink) Old 10-28-2018, 04:12 PM Thread Starter
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Quote:
Originally Posted by tempdownload View Post
Question how did you or how does one know what oil grade a dealership uses?

(Other than ask)
It is clearly stated in the service invoice. They used 0W20 Havoline Synthetic.
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post #8 of 52 (permalink) Old 10-29-2018, 08:56 AM
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What the others said - You'll be fine but absolutely don't let it happen again and let them know they screwed up.

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post #9 of 52 (permalink) Old 10-29-2018, 10:06 AM
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I would NOT leave that oil in there. It won't hurt the engine (at all) but it MAY cause turbo trouble down the road, and I would also pay close attention to oil level, since the thinner viscosity is likely to result in materially higher consumption through turbo bypass (which ultimately goes down the intake and gets burned up.)

And use the correct (full-synthetic) 5w30.
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post #10 of 52 (permalink) Old 10-29-2018, 11:25 AM Thread Starter
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Contacted dealer again this morning. They still wouldn't admit they screwed up and still claimed 0W20 is perfect in Florida area (where I live).
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