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You guys are probably paying too much for fuel adds. My 335D has been running with 2-stroke oil at a treat rate of 1oz/gal as a fuel additive for about 5 years. The emissions equipment has been absent for a couple years, but the suspension, injectors and maintenance items like filters, tires, brakes, etc. is the only stuff on the car not factory original, including the belts - now at 125k miles. The injectors were replaced as part of the CBU repair because they were dirty, not worn.
The injection pump is normally the 1st thing to go when fuel issues arise.
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