This will solve your hard to remove cap for years to come. For 1998 to 2006 models
You will not believe the difference a new cap can make in terms of ease of removal. It wont last forever due to age and heat. So when it starts getting hard to remove you can just replace the seal and put a little oil on it! What a great kit!!!
M112 V6 and M113 V8 Oil Filler Cap w/ Three Replacement Seals
$13.75
SKU:
GEG-M113OILCAPKIT 
Product Details
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$12.80
Black Plastic Oil Filler Cap Wrist Saver
For many models from 1986 up through 2006. Why is it soooo hard to get these oil caps off!!!
Kent finally got so frustrated trying to get these oil caps off that he came up with this new tool he chose to call the wrist saver. Watch the video to see this unique tool in action.