I have a '94 318i with 125K miles. Looking for info on keeping it going. Currently it is in great mechanical shape. I am curious about a kit that cleans the fuel system, injectors AND carbon buildup on intake valves that is offered by BAVAUTO. RPM
Seafoaming is a very popular, and effective way to do what you want. I've never done it with a 318, but the basic idea is that you can suck seafoam directly into the intake VIA the brake booster line.
Here's a DIY on the 325
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