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Well, I took my car to a shop to get fixed and the car just had an oil-change like 100 miles ago with Mobil 1 15w50 Full Synthetic. The car was leaking oil all over the place so the guy fixed the leak and he topped the oil off which was about a quart with normal Castrol GTX oil. Is that bad? Could the car be driven for a while until I get a new oil-change? Thanks for your help!!!

~Farhad G.
 

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No, it won't hurt anything...

Despite the name, "Synthetic" its not synthetic, Synthetic oil is made out of good old oil....
 

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Supra Owner Since 1996
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you can buy blended oil that is 50/50 synthetic/mineral.
 

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Will work for Supra parts
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Yup, as the others said, no harm will result. Manufacturers do partical snythetic blends all the time!
 

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Misty and Wet
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What is potentially worse is mixing two different fully synthetics.

Straight 'dino' oil is regarded to be safe to be mixed with synth. It just dilutes it and you want to change the whole lot earlier than normal, as others have already said.
 

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the only issue with this is your turbos may cook that oil quicker now. this is just a bandage fix, just remember dont be at ease.... get those leaks fixed!
 

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GO 'Cats!
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What happens when...?

JohnA said:
What is potentially worse is mixing two different fully synthetics.
Two synthetics are mixed?
 

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Misty and Wet
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No, I meant having a fully synth in the sump and refilling with fully synth of a different manufacturer.
Reactions amongst proprietary additives is more likely to happen in this case.
 

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GO 'Cats!
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JohnA said:
No, I meant having a fully synth in the sump and refilling with fully synth of a different manufacturer.
Reactions amongst proprietary additives is more likely to happen in this case.
Damn those proprietary additives to Hell anyway. Thanks for the info. Never heard of anything bad happening but it seems like the potential increases.
 

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oooooohh.... im not familar w/ castrol products but i assumed the GTX was the nonsynthetic. there shouldnt be any issues as long as the weights are the same
 

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GO 'Cats!
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I believe you are correct. The GTX is non and the Syntec is the synthetic.
 

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JohnA said:
No, I meant having a fully synth in the sump and refilling with fully synth of a different manufacturer.
Reactions amongst proprietary additives is more likely to happen in this case.
Out of curiousity what is the worst that may happen if the proprietary additives have the most horrible Gosh awful Holy S$%^ reaction?
 

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Misty and Wet
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The manufacturers themselves recommend to avoid mixing them around.
Hard to tell what the products of a potential reaction could be - deposits, reduced protection, who knows, it would depend on the combination of ingredients, wouldn't it?

Better safe than sorry eh
 

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i heard bad things. but not sure tho.
 

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BLACKOUT
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Hands On said:
you can buy blended oil that is 50/50 synthetic/mineral.

notice how they call it a BLEND , they never tell you what the % is .....could be 95% reg. oil and 5% synthetic , that would be considered a BLEND ......although there is no problem with mixing oils ( synthetic and reg) i would stay away with those prepackaged blends ......
 

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SUPRA180 said:
notice how they call it a BLEND , they never tell you what the % is .....could be 95% reg. oil and 5% synthetic , that would be considered a BLEND ......although there is no problem with mixing oils ( synthetic and reg) i would stay away with those prepackaged blends ......
Some of them will have 50/50 on the label. Isn't that the %?
 
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