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It depends on the type of synthetic oil -
Synthetic oils based on polyalphaolefin (PAO) / ester blends (e.g. Mobil 1) can be mixed with conventional oil - but you lose the benefit of the synthetic components the more you dilute it.
You need to ask yourself why you want to mix it or why you need to use the synthetic oil in the first place - if you're using a synthetic to overcome a mechanical problem (e.g. insufficient heat transfer / oil cooling) then mixing with conventional oil is a waste as you won't fix the problem, same for synthetic gear oils if you are looking for heat transfer out of the drive train - only the "pure" oil will give the best heat transfer response.
OTOH, if you are looking for extended oil drain interval, mixing synthetic 50/50 with conventional oil will assist.
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∙ 14y ago
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If you use a synthetic oil can you change back to a conventional oil?
Yes, you can even mix synthetic with conventional oil.
Can you mix semi synthetic oil with fully synthetic oil?
Yes, many believe that you can not mix any oil blend together. This is not true, full synthetic can be mixed with conventional also with no harm. If this is done, there is just wasted cash when buying the synthetic.
What happens when mix synthetics with non synthetics?
Synthetic and conventional oil can be mixed and used with no problem. That is exactly what a synthetic blend that you can buy is. A mix of synthetic oil and conventional.
Can you mix different brands of synthetic oils?
Yes you can mix different brands but I recommend you do not mix different weights. You can even mix synthetic oil with conventional oil. But as the weight of the oil is critical, do not ever mix one weight of oil with another, no matter if it is synthetic or conventional oil.
Can you use synthetic oil in my acura?
Yes, of course you can. You can even mix synthetic with conventional oil.
Can you mix synthetic with a synthetic blend in your diesel?
Yes, you can also mix it with conventional oil creating a blend.
Does the 2006 Dodge Ram take fully synthetic oil?
It is not required. You can use conventional or synthetic oil.
Can you mix full synthetic with semi synthetic gear oil?
Yes, semi synthetic is a blend of synthetic and conventional oil already.
Can you use synthetic oil in your 2001 Infiniti QX4?
Yes, you can even mix synthetic with conventional oil.
Can you switch your from synthetic to conventional motor oil?
Yes, or you can mix them. Just bear in mind that if you mix them, you must maintain as if it were straight conventional oil and that by mixing, you lose pretty much all of the benefits that synthetic oil has.
Is synthetic oil ok for your Honda accord?
Yes, you can use synthetic, conventional, or a mix of the two.
Why is it not recommended to mix synthetic oils?
Who told you it is not recommended? You can mix synthetics as long as they are of the same weight. You can even mix synthetic with conventional oil.
