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Old 05-07-2014, 10:29 AM   #1
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Motorcraft 10W40 Synthetic

What do you guys thinking on the Ford Recommended Motorcraft 10W40 Synthetic oil?
It will soon be my 3rd oil change and trying to decide if I should just continue sticking with the Motorcraft or to switch it up.

I heard if you're not constantly racing down the track, the 10W40 does the job. On the other hand, if driven hard frequently, Amsoil or Royal Purple would be the better bet?

How many of you use Motorcraft 10W40 Synthetic?
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Old 05-07-2014, 01:32 PM   #2
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Maybe im lost but...

Maybe I am lost but thought they state 5-20W Multi-Blend for the GT. Unless racing? I am now interested even more in this posting.
I never understood why the 50W for racing verses 20W driving? Long driving would heat up more in the long run..

I am now sitting back to read..
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Old 05-07-2014, 02:04 PM   #3
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I also have not seen 10w40 recommend by ford. Only 5w20 and 5w50. Side note: I'm considering using amsoil SS 10w30.......

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Old 05-07-2014, 03:50 PM   #4
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Quote:
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Side note: I'm considering using amsoil SS 10w30.......
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Old 05-08-2014, 09:48 PM   #5
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I would assume adding 10w40 when it clearly recommends 5w20 would make the engine work harder to circulate that oil correctly.
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Old 05-08-2014, 09:51 PM   #6
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Don't need a 10w in this engine. Try a 5w30 or something. I know some use the castrol 0w30 and 0w40

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Old 05-08-2014, 11:42 PM   #7
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Quote:
Originally Posted by seville View Post
What do you guys thinking on the Ford Recommended Motorcraft 10W40 Synthetic oil?
It will soon be my 3rd oil change and trying to decide if I should just continue sticking with the Motorcraft or to switch it up.

I heard if you're not constantly racing down the track, the 10W40 does the job. On the other hand, if driven hard frequently, Amsoil or Royal Purple would be the better bet?

How many of you use Motorcraft 10W40 Synthetic?
Since when did ford change the oil recommendations to 10W 40. I thought it was standard 5W 20 or 5W 50 for Boss or track pac on Gt models.
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Old 05-09-2014, 04:57 AM   #8
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Originally Posted by 5.0FRDPWR View Post
Don't need a 10w in this engine. Try a 5w30 or something. I know some use the castrol 0w30 and 0w40
Wrong. Many of us are using Amsoil 10w-30 with good results. This is based on UOA reports, not opinion.
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