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Makes sense, I now realize that it's pretty much identical to what I did on my last change when I added the Castrol to a sump of TPT. Thanks for the reply, I appreciate the logic in your answer.

I recently switched from TPT to Castrol Edge 0W-20 Euro which has the same certification (LL17Fe+). But now I'm due for another change and the Castrol is getting to be hard to find. I have an extra liter of TPT LL17Fe+ the I was keeping as a spare when the car was under warranty, and about 5qts...