Definitely use the BG44k. It really made a difference and recently I found out, at least in California, so does the gas. After reading for years all the ******* on the boards asserting gas is gas I can prove it's not true. At least in Los Angeles. Maybe gas is gas but the Additives make a HUGE difference on our engines when running 91 octane which is all we can get here. Using Costco or Mobile gas I would get rough idle a lot and not great gas mileage. I have now only used Shell V-power for over a month. Starting with an empty tank and filling it with V-power I noticed the difference immediately. And I got about 1 to 1.5 more MPG on the V-power (avg 14.6mpg - a lot of slow city driving). Doesn't sound like a lot but on a disco that's almost 10% better than I got on Costco gas. It costs me about $2.50 more a tank but I'll probably make that up in mileage and savings on future injector treatments. I will never pinch pennies on gas again. More power, better mpg, smoother idle. I drove a 2004 with 52k on it and it sounded and ran like a truck with 500k on it compared to my 2003 with 90k after the BG treatment and v-power fill up.

 

I have the same rig 03 Disco II , 241,000 miles..my codes are showing to lean...and I get them when it warms up starts to have the lifter noise.