I run both Lucas oil additive and Lucas fuel treatment in everything here and have for decades.
Couldn't tell if the oil treatment helps but I've had zero issues with any engines I use it in.
I know for sure the fuel treatment works as I get more MPG's in my Nissan Xterra and you can notice the improvement in power vs not using it.
I've also owned quite a few diesel powered trucks and make up my own mixture of Lucas fuel treatment and 2 stroke engine oil. They all get a few ounces at every fill-up and never in all the years and thousands of miles of use did I have one single fuel pump, injector or other fuel system related issue with any of them.
Matter of fact if you own a Duramax with the CP4 pump, or a Ford or Dodge diesel that used that pump you need to be using a lubricant in the fuel. CP4 pumps are actually better than the CP3's, and they have next to zero issues with them in Countries that didn't remove everything from the diesel fuel, but here in the USA catastrophic CP4 pump failures are a HUGE problem, especially for LML Duramax engines.......FWIW.....
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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