Synthetic Question (1 Viewer)

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Dec 11, 2006
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Rockwall, TX
Is there any harm in changing to Synthetic on an '03 4.7 with 65k on the clock?
 
Nope, your engine will thank you for it.
 
Done! Thanks!
 
I changed my 03 V8 to synthetic at 40k. I'm now at 64k and it seems to be running better than ever. I have run nothing but Mobil 1 5W-30.
 
Just changed to 5w30 Mobile 1 !
 
M1 5/30W switched at 65k on my GX.
All is good.:)
 

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