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It is a great idea and the flex bottle works great, but Valvoline only packages the $21 full synthetic 75W-90 in it. If you have an older car and want to use the $14 pure dino stuff you are stuck with the old bottle. I put synthetic in my VW, but was warned against it in my 356. I saved a flex bottle from the synthetic and transferred the dino oil into it in order to fill my '56 coupe.
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