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How do I change my gearbox oil

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Topic starter

Hi Scotty!  I have a 2008 Mustang GT 4.6 V8 3V  5 speed standard with 70,000 original miles.  I want to flush the old transmission fluid.  Owners manual says to use ATF fluid.  I have a few bottles of Royal Purple synromax manual transmission fluid, would that be safe to use?  One other question... What quality spark plugs do you recommend?  I have used regular Ford Motorcraft plugs last change at 40,000 miles.   Thanks for posting all your videos.  Great learning and entertainment!  

Mark

6 Answers
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Use whatever the manual tells you. Transmission and plugs.

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What do you mean by 5 speed standard?  Is this a manual or automatic transmission?  What lubricant does your owner's manual specify for your vehicle's transmission?

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Posted by: @oceanlife76

I want to flush the old transmission fluid.

Why exactly?

Posted by: @oceanlife76

I have a few bottles of Royal Purple synromax manual transmission fluid, would that be safe to use? 

No.

For spark plugs, check the owner's manual for specs. Iridium spark plugs usually last a long time.  Denso and NGK are good brands. 

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Some manual transmissions due in fact use ATF. My 5th gen (2011 &2015) Camaro SS with 6spd manual called for ATF. I used the best Amsoil ATF when I changed the fluid out. I've had bad luck with Royal Purple products, so I don't ever recommend using their fluids. Your owner's manual should call out what plugs and transmission fluid to use. 

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Topic starter

My bad...  5 speed standard shift manual trans.  Owners manual says Mercon ATF.  I never heard of using ATF in a manual tansmission.

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Everything I could find says, beginning with the 2008 model, 3.2 quarts Mercon V.

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