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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 gotta use full synthetic so he changed my oil with full synthetic. Synthetic has never been used in this truck and truck has 312,558 is it gonna make my engine start using oil.i read it will then read it wont so im ok confused. Thanks

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  • Cars & Trucks Master
  • 5,476 Answers

Generally synthetic oil has better all round properties then normal oil! The argument for high mileage engines is that they have more wear in the cylinders and Pistons/rings so will not be as sealed and could burn more oil which would be more noticeable with fully synthetic compared to thicker normal oil! It will depend on how worn your engine is, if you have not noticed any increase in oil usage so far then you should be ok!

Posted on Dec 02, 2014

  • Josh j Dec 02, 2014

    Thanks havent noticed any oil useage but the weight of oil was 10w40 now its 10w30 full synthetic

  • Anonymous Dec 02, 2014

    Should be 5W-30 Have not used 10W-40 in a GM Veh since the 1970's

×

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

Posted on Dec 02, 2014

  • Josh j Dec 02, 2014

    Thats what i thought but wasnt gonna argue

×

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jmgldsmth
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SOURCE: can you use full synthetic engine oil in a x type jaguar?

use one or the other they do not mix different heat viscosity requirements

Posted on Apr 22, 2009

SOURCE: synthetic oil

synthetic motor oil is never a waste of anything some of it is truly amazing how it can protect surfaces and reduce friction. I'd use it. Expensive though.

Posted on Jan 27, 2010

Molson02536
  • 3854 Answers

SOURCE: 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.
Good luck and hope this helps.

Posted on Mar 07, 2010

  • 152 Answers

SOURCE: what would happen if i used a synthetic blend or a

No it will not hurt your engine at all. Actually it will give you a performance boost and a mileage increase.

But, it will also probably cause some leaks that you didn;t have before. Synthetic oil molecules tend to be smaller than their conventional counterparts and if you have any weak gaskets such as the valve cover gasket or the oil pan gasket it will find a way to leak from it. I would try it and if you experience any leakage you can switch back to conventional.

Posted on Apr 09, 2010

  • 11 Answers

SOURCE: Hello i have a couple of questions. Question #1 my

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

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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...


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.

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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.
Good luck and hope this helps.

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