Oil Recommendation ?

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I saw the price on the walmart synthetic oil change deal and allowed them to change the oil on my 2003 Range Rover. Everything was fine until the next morning there was a puddle of oil under my car. I crawled underneath and the oil plug was dripping precipitously. I immediately called the store and the shop manager came to my house. He was very polite (almost grovelling). I was worried that some big galute had overtorqued my plug and crapped the threads but it turned out that the crush washer was simply left off. He replaced it, offered me a host of free services and generally did everything he could have done to make it right.

Now every time I go to Walmart I get a big hello from the manager and I have since taken my Boxster to them to patch a nail in one tire which they did to my exact instructions.

I dont know if every Walmart has as dedicated hard working management as this one and I have certainly heard my share of horror stories. I have not yet considered taking a Porsche there for an oil change but they did make it all right on the Rover. I just dont want to be in a situation where they have to make it right on my Porsche if that makes sense.