5W30 vs 10W40 in hot weather | Ford Explorer Forums - Serious Explorations

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5W30 vs 10W40 in hot weather

MyFirstFord1

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Year, Model & Trim Level
03 Sport trac XLT
Hi guys.

So I changed my oil and I used the recommended 5W30
But I have had more than 1 person tell me I should definitely use 10W40 because of the age / mileage and because of the temp here. I recently moved to the island of Aruba where it is a very hot all year round.

I don't drive it often (3rd vehicle / our 'island' car) But one thing I have noticed the other day when I was driving it - after about 15 mins of driving, it sounded like there was a rattle coming from the engine (as if it had the bad timing chain issues these truck are known for)

But I thought if you had that issue, you would definitely hear it at start up if anything...
I bought this truck because I didn't hear any rattle at start up so I thought I was safe (for now)

Anyhow, not sure if that has anything to do with my oil choice... The truck has 86k miles.

Any input on this as well would be appreciated!
 



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Never use anything other than 5W30 in the SOHC engine. The rattle is due to timing chain problems, but using a thicker oil will not help.

Edit:
At 86k you may be able to eliminate rattling by replacing the front and rear hydraulic timing change tensioners. Some here believe they should be replaced every 75k. I've been to Aruba (beautiful island) but what is 5 miles wide x 9 miles long? I don't imagine you'll be putting a lot of miles on your ST unless you run a food delivery service... LOL.
 






It is recommended to use 10w30, NOT 10w40 when the temperature is over 32°F. 10w40 is just too thick at any temperature.
 






It is recommended to use 10w30, NOT 10w40 when the temperature is over 32°F. 10w40 is just too thick at any temperature.

There may be a chart in the owner's manual showing that w/in a specific temp ranges either 5W30 or 10W30 is okay. For Aruba, it's gonna end up being 30 weight no matter which you put in, as the 5W or 10W wont really come into play unless temps are below 86 degrees. 10W40 weight is too thick.
 






You could see what Sport Tracs sold in Aruba were recommended to use.
 






You could see what Sport Tracs sold in Aruba were recommended to use.

Aruba's not a very big place. I don't think they have any car dealerships. Mostly hotels, a few restaurants, a small airport and some casino's when I was there in the late 70's. I'm sure it's changed, but I'd guess all their vehicles are imported from somewhere, probably from Venezuela.
 






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