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Discussion Starter #1
Hi, I have an 04 GT with roughly 15,000 miles on it. I got it with 9,000 miles on it and had put regular 5w20 oil in it but I am wanting to switch to a 5w20 full synthetic by royal purple. I was wondering, with the engine being used since I have had it with regular oil in it, will it hurt the engine switching over to using full synthetic from now on?
 

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Billy Weston
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it'll be fine.....
 

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its fine...its actually better to run a newer motor with dino oil for a while anyway..lets everything seat better....i wish i still had 15,000 on my motor
 

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yeah, itll be fine.. i think the mark when it could be a bad idea to change is around 40k miles
 

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Discussion Starter #6
thanks, synthetic it is.
 
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