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That is a pretty difficult question to answer considering the large number of brands and product lines in the marketplace. The actual blend percentages are likely to be as varied as the brands and formulations themselves. Most specs are proprietary but you may be able to find approximate percentages by contacting customer support departments of the various producers.

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Q: What is the percentage of synthetic oil in semi-synthetic blends?
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What percentage makes a synthetic oil synthetic?

Synthetic is 100% synthetic. There are blends sold that are part synthetic & regular oil. Look for a quart that sates FULL or 100% Synthetic. If it says Synthetic Blend then it is not 100% Synthetic.Synthetic is 100% synthetic. There are blends sold that are part synthetic & regular oil. Look for a quart that sates FULL or 100% Synthetic. If it says Synthetic Blend then it is not 100% Synthetic.


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What is the effect mixing 5-30 synthetic oil with 10-40 semisynthetic?

Mixing synthetic with semi-cynthetic or even conventional will cause no harm at all. Mixing weight will give you another weight based on the mix. If you mixed 2 quarts of 5w30 with 2 quarts of 10w40 you will theoretically have a weight of 7.5w35.


Can you mix part synthetic oil full synthetic oil?

You can mix part synthetic oil with full synthetic oil.


Can you mix fully synthetic oil with conventional?

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.


What is the different semi synthetic oil and syntetic?

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What kind of oil does a 2006 trailblazer use?

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