adjustment for makeup oil?

[cheetahdriver]

so i am getting ready to do an OA on my miata, which i have changed from M1 0w40 to M1 0w20 for this 10k OCI. my question is, over the course of a 0w40 OCI, i will make up about a quart, and it will be about 1/2 a quart low. on this OCI, i will have made up 2qts, and it will be about a 1/4 qt low.

so is there a standard adjustment to try to get to an apples to apples comparison?

 

[demarpaint]

Great question, wish I had an answer. Why not shoot the lab doing the UOA an email and ask them? They must have some idea on how you can make an apples to apples comparison.

 

[roushstage2]

The lab should be able to adjust it based on past UOA's. On the Blackstone slip for example, it asks you how many make up quarts you have added.