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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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Posted on Dec 02, 2010

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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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OIl, synthetic or regular, what's the difference?


Synthetic oil won't break down as quickly as conventional oil, gives better protection and longer life. Excellent product, I Strongly suggested for those out there who forget to do their oil changes regularly or courier/ work vehicles.
Heres the link to an explaination from Castrol
http://www.castrol.com/castrol/genericarticle.do?categoryId=8264018&contentId=6003233
I use conventional Oil in my jimmy with 5% of Lucas engine oil treatment and service the engine every 3,000 miles. I find it to costly for the Synthetic oil every 3,000 miles, and as for the high mileage oil you can buy. The high mileage oil has a higher fluid retention like adding Lucas engine oil treatment to any conventional oil, so you decide on what type of oil you like to use in your engine.
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Change from regular to synthetic oil after 20,000 miles


No you should not have any problems once the car is broke in. but some of the little things you will notice is a little better fuel mileage. and less wear on your engine now keep in mind that synthetic oil should still be changed at the regular intervals. I just finally switched all my cars over to Synthetic. and hear is a few of the cars 1976 Dodge. and my 1968 dodge polara.
hope this answers your question
and I highly Recomend Switching your Differential Fluid to Synthetic also.
Please rate me if you wouldnt mind
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I would change the oil to a premium synthetic such as Mobil 1 or Castrol. The oil weight should be what your owner's manual recommends. If you do have the owner's manual normal maintenance should be listed, otherwise do a search on the Internet. Using a good synthetic oil allows you to change oil and filter less frequently, say 5 to 10K miles. I change mine once per year unless I've done lots of city, stop and go driving. Nice car, glad you want to take care of it!

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