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I also had a bad outcome after taking the hook on a so-called fuel system cleaning. This was at a reputable shop, but the 83 did not run any better, and overall fuel economy dropped by about 10%. Not sure what got screwed up, but something did. OK, I'm cynical, but my opinion is that those chemical cleaners are just a money maker for the seller, and most of the time produce no measurable benefit for you - the guy who paid. You can't go wrong with this general rule: Additives are worthless.
Can't think why the car would start using oil after the FI work, unless they hooked the PCV system up wrong.
I have only been to a "speedi-lube" once (circumstances forced to do so) and insisted on standing just outside the service bay and watching their every move. They did the oil change OK. I could see that the guy in the pit never checked the rear axle, but that didn't stop them from writing on their work order that axle lube was OK. Also wrote that all tires were at 32psi. I checked in their parking lot with my accurate gauge at 26psi. Bitched to the manager who personally "took care of it". I went for a coffee. Mistake. Gassing up a couple of blocks away I decided to recheck...32psi all right - on ONE SIDE of the car!
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Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD; plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)
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