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Yeah, ,my next oil change will be the castrol Syntec 10-40 for sure
I have been reading that Castrol Syntec isnt really a TRUE FULL synthetic oil though??? Apparently the raw oil they start out with for this product is still dino oil. Mobil sued them years ago for this.
Can do a quick search on this ...... "Castrol Syntec not real synthetic" will give you some good reads!
Is the current Castrol Syntec actually full synthetic??
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