2003 Ford Explorer 4x4 4.6L V8 oil change?

I have a 2003 Ford Explorer 4x4 with the 4.6L V8 with about 137000 miles and it's due for an oil change and its the first since I have owned it but I do not know what the previous owner used. The manual tells me to use 5w20 but I have been told its probably better to use 10w40 because of the mileage but I don't know if this is true. Also full synthetic vs synthetic blend? Best brand?

TIA for responses!

Hot air won't turn off in rear of 2006 Ford Explorer?

No matter what I do if the engine is running hot air blows at full force out of the overhead vents in the car. It's miserable for my kids. I closed the vents and tried pushing the off button but it still blows. I turned on the AC but that did nothing. I tried changing temp with the dual setting but it also did nothing. Help please, also I do have a warranty that covers the air conditioning, do you think this will be covered?

Hifonics Subwoofers any good?

What are some opinions on 2 12inch Hifonics Brutus subwoofers. I've looked and can't really find any reviews on them. I'm thinking about putting them in a 2004 Ford Explorer with a 1600 watt amp.

2000 ford explorer won't start?

Instrument panel will come on and it will ding as usual but when I turn the key it won't turnover or even try to turnover. Radio isn't coming on either.

Ford explorer 1992 4wd transmission?

It was going through fluid like it had a leak no sign now it only wants to drive in reverse won't go in gear. It's holding fluid now but won't go in gear?

Where should I sell my old ring and tires? - 1

I have a white gold (or platinum) ring with diamonds that I want to sell. I bought it 20 years ago, and some of the tiny diamonds on it are gone. Is the place like "cash for gold" best place to sell it? Pawn shop?

I also want to sell 8 snow tires that I used on 2005 Ford explorer that I bought 4 years ago and are in very good condition. It's harder than I thought to find a place to buy used tires. Any recommendation? Craigslist?

Where should I sell my old ring and tires?

I have a white gold (or platinum) ring with diamonds that I want to sell. I bought it 20 years ago, and some of the tiny diamonds are gone. Is the place like "cash for gold" best place to sell it? Pawn shop?

I also want to sell 8 snow tires off 2005 Ford explorer that I bought 4 years ago and are in very good condition. It's harder than I thought to find a place to buy used tires. Any recommendation? Craigslist?

What's the right car for me?

First off, I currently have a car. Its a 1999 Ford Explorer. The only thing is the gas is becoming an issue. She gets 13.8 gallons a mile! Terrible for this economy. I'm looking for a gas efficient car that has good cargo space. If you good people know any such car please let me know!