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It's a Diesel, which means that you usually have a high detergent oil in an engine that dumps combustion by-products like soot into the oil as part of its normal operation. Given the age of the vehicle I'm not surprised that the oil has noticeably darkened after 10 miles - one of the older Diesels I owned a while back did that during the time it took to run ...

To add to what others have said, diesel lube oil (the code starts with "C", like "CJ") is formulated to hold lots of soot, and after 10,000 miles, there probably was a lot of soot in the remaining oil that got mixed in with the new oil. When changing your own, never put "S" (for "spark") rated oil in a diesel engine!

A good trick is to put a small mark on the filter, e.g. a scratch or bit of marker pen that you can identify, but isn't obvious. When you get the car back, check to see that the mark is gone (i.e. they have changed the filter). If the mark is still there, you still have the old filter, and you know you've been screwed...

White smoke is most likely to be oil- so you want to check your gaskets and seals. Can you smell burnt oil? Another possibility is antifreeze or coolant, so if you don't smell oil these are something else to check. Actually just found an interesting chart at www.jhdiesel.com/failurechart1.htm which has a list of possible symptoms and causes. If you look ...

Disadvantage is that tampering with emissions systems makes a vehicle no longer street legal. Other than that, it probably won't hurt anything at all. I don't see how removing EGR will increase power though. EGR closes at high power settings anyways. The gain would be entirely from some other feature of the racepipe (perhaps it's bigger). The fact that ...