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      07-28-2020, 12:58 PM   #9
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patchesj's Avatar

Drives: BMW M6
Join Date: Jul 2020
Location: KY

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Originally Posted by LJohnson32 View Post
I just did my first oil change of my ownership about a week ago along with new plugs and coils.

I purchased the car CPO from BMW at ~46k miles and the oil change was done when they took the vehicle in initially. I changed it at just under 50k. I did not have to add oil at any time during this 4k mile interval.

Given that the oil was serviced at BMW's recommended interval of 10k in previous ownership I wanted to try and get the car back to as clean of slate as possible.

Prior to the oil change I used 2 500ml cans of Liqui Moly Engine Flush to help remove any sludgy build up from the long intervals of previous oil changes. I went with Liqui Moly Molygen 5W-40 for the new oil along with 2 300ml Bottles of Liqui Moly Ceratec in with it to 'rejuvenate' the internals in a sense.

* Both the Engine Flush and Ceratec products are to be used only every 5th oil service or 25,000 miles per Liqui Moly spec.

I would like to do a Blackstone analysis once this oil comes out at 55k but my question is would the Ceratec additive skew the analysis on the oil coming out? Should I wait for the following oil service at 60k where ONLY the Liqui Moly 5W-40 Molygen is what is coming out of the engine for a true sample?

This might be a very good question for LiquiMoly tech support. Personally, I would test both times... Also, I've heard LiquiMoly say you didn't need to use more additives with MolyGen as "it's already in there"?