I've narrowed down the issue to running the car on WVO. I just purchased a beautiful 1999 E300DT and it is like a race car compared to my N/A 1996 E300. I put about 5 gallons of WVO in it and it is doing something similar now. I think it has to do with the thickness and the fact that I have NO conversions whatsoever on the cars. I'm thinking if I put an in tank heater of somekind in, that will alleviate the issue. Any recommendations on one to get?

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2022 Nissan Frontier Pro4x
1990 Mercedes 420SEL
1950 Packard 8

Previous German cars-
2001 Mercedes SL500
1983 Mercedes 300SD
2011 BMW 328i (manual)
2008 BMW 535xi (manual)
2006 BMW M3 (manual)
1980 Mercedes 300TD
2006 BMW 750i
1996 Mercedes E300D
1994 BMW 740i
2006 BMW 330xi (manual)
1999 E300DT Smoke silver/black 253k
2012 BMW 535i Xdrive M-Sport
1984 300TD-T 304k
1988 Mercedes 560SEL (parts car)
2010 BMW 550i xdrive
2017 Audi A4 Presitge
1979 300SD 313k
2003 E500 189k