It seems like version 15.10.0 might have compatibility issues with modded fluids. Whenever I start up an engine fueled by biodiesel or ethanol, the game immediately crashes with a ticking entity error. I could easily reproduce this error on a local server, so I suspect it might have something to do with the engine not correctly reading the fuel type from the new json, but since I didn't take a look at the code yet, I can't tell.
The only vehicles and parts I used were those from the official pack.

Lava works though, as do the creative engines with no fuel draw.

Does sound like it could be a compat issue. Got a crash report?

crash-2020-01-27_20.01.53-client.txt

Yup, here you go.

This is similar to #315. For both, I added debug information V16.1.0's crash report that should tell you exactly what is wrong. Will leave this ticket open for a few days and if I don't hear anything else I"ll assume it's fixed.

Assuming it's fixed.

So it turns out this was NOT fixed, and is related to pack loading order, not other mods.
See Commit: 305be9f