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Hello i have a couple of questions. Question #1 my truck has 312,332 miles on it and ive been told that the vortec 5.7 requires synthetic but with that many miles and synthetic never being used will it hurt the engine. Question #2 ive read back and forth about seafoam agian its never been used but i just got the truck and dont wanna do something thats gonna hurt it. Question #3 my truck already has alot of problems and will doing these things make things worse? Thanks everyone

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Do not use synthetic oil in a motor with that many miles, it will start leaking very bad. Use oil that indicates high mileage type, it has seal conditioners in it. Also, do not use seafo either, it too will cause isues in an old motor. Try to change nothing, again, use an oil that's intended for high mileage motors.

Posted on Nov 30, 2014

  • Josh j Nov 30, 2014

    Thank you i dont wanna mess my truck up i wanna few more years outta it. What kinda issues will seafoam cause sorry for the questions i dont wanna do something bad


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2 Answers

Hi i have a question im confused i read back and forth on synthetic oil and can you use it in high mileage engines reason i ask is i just had my oil changed and my mechanic told me that vortec engines...

Best to use Full Syn in all motors-- if you don't mind
the extra price per quart

All the debate & that is all it is- has been going around
for 50 years, on synthetic oils

At 300,000 that motor is done & will use oil regardless
of what you put in it,so the answer is no,the oil has nothing
to do with it

Seems just plain silly for a professional to now after 312,000
to put in synthetic oil,sort of late & just silly,they don't make
money on an oil change they loose money anyway

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Please rate me if you wouldnt mind
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