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Old 04-14-2009, 17:22   #1 (permalink)
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5w-20 Or 10w-30 ?

I just bought a used 2006 grand marquis. Ford requires 5W-20. I live in San antonio Tx, with hot summers, so I have always used 10W-30 for the previous 97 and 98 models. However this engine may be designed a little better. I wanted to use 10W-30 blend. what do you recommend. (45 k on it).
thanks
art
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Old 04-14-2009, 18:17   #2 (permalink)
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Re: 5w-20 Or 10w-30 ?

i am only taking a guess, but is it a flex fuel model that can run on E85? just curious, i notice many vehicles that are use 5-20w to help with better mileage. i would use the thinner oil now and go thicker later in the cars life when leaks start appearing.
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Old 04-14-2009, 21:23   #3 (permalink)
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Re: 5w-20 Or 10w-30 ?

It's best to use what the factory recommends. All the newer Fords use 5-20 now. They have closer tolerances and the thicker oil doesn't get there as fast. 10-30 isn't that much thicker but it's still best to use what's called for.
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Old 04-15-2009, 15:58   #4 (permalink)
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Re: 5w-20 Or 10w-30 ?

thanks for the info, yes it is a flex fuel but dont ever plan on using the newer fuel, just regular. The thing I worry about is if when its 100 degrees here this summer and I have to do a few full throttles here and there, I just dont want that engine to run hard with the 5w-20. I figured the 10w-30 would be able to handle the hotter temperature. Regardless I will surely go to blend - I think it already has 5w-20 blend in it but I'm still 50/50 on 20weight or 30 weight. again thanks.
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Old 04-16-2009, 09:32   #5 (permalink)
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Re: 5w-20 Or 10w-30 ?

Running 5w-20 is fine. It's recommended in my '99 Taurus as well. Ford's been recommending it for a long time to help boost their CAFE (corporate average fuel economy), as they're vehicles are known to be heavy in their respective size class. If you wanted to, you could run a 0W30 oil. It flows a lot faster, especially in warm climates.

As you have low mileage you shouldn't need to run a synthetic blend. If it makes you feel better or if cost is an issue, that's fine of course, but I recommend full synthetic. It allows less internal component (read: engine) wear, and can also give you a longer time between changes. I've been running Amsoil synthetics in my vehicles for years and have noticed a lot better throttle response, pick up on the highway, and in some cases better mileage. In my Durango when I tow a load, it only burns half a quart of oil now every 4K, instead of 1K of regular oil every 2.5K. I could go longer on synthetic oil, but it does break down fast when I tow.

High mileage engine oil isn't necessary. It's available for those that don't know if they want to switch up to full synthetic or not, but like to think they're doing something good for their vehicle. Ultimately it comes down to personal preference. Amsoil and Mobil1 are the best oils on the market. If you don't burn through any oil, or very little, between changes, I recommend either brand for BEST performance and durability for the long haul.

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Old 04-16-2009, 16:42   #6 (permalink)
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Re: 5w-20 Or 10w-30 ?

360ci, thanks on the info. So your saying that 5w-20 is okay for here in south texas when it get to about 100 + degrees in the summer (10w-30 wouldnt make any difference) and you recommend full syn instead of blend?
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Old 04-18-2009, 09:50   #7 (permalink)
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Re: 5w-20 Or 10w-30 ?

I don't know about that recommendation for 5W-20 even in very hot conditions. I've always used heavier oil, especially in higher mileage vehicles, in the summer. Yes, the newer oils are better and the engines have tighter specs but you have to wonder how much difference it would make if you went up one weight or so. If you start your car in the morning and it's 80 degrees outside, 10W30 probably would flow just fine and give you better protection when it's 102!

You have to remember Ford as a lot riding on meeting CAFE specs and the lighter oil helps them do that. I would question some of the fleet owners in your area and see what the use...
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Old 04-18-2009, 19:15   #8 (permalink)
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Re: 5w-20 Or 10w-30 ?

I agree, the CAFE specs stuff throws another variable into the equation. I talked to a mechanic and he said to stay with the 5W-20. but like I said I live in San Antonio Texas and we do hit near 100 degrees in the summer, so I used 10w-40 in the two previous cars (97 and 98 model - which both got totaled out, the first a straight head on me going 82 and the other driver 76 and the second a front side on by a 4x4 that floored it thru a red light and hit me and I'm still here so I bought this 3rd car the 2006, but this time I had to go used). So if its 100 degress and figure that engine is a lot hotter and with stop and go and even on highway running a/c I figure that engine could use the 40w down south. The mechainic and other on this site stated that the tolerances are probably tighter for this newer engine and 5W-20 would be recommend. I will go with the 5W-20, but on the next I am going to full snythetic, right now it has blend.
thanks for your info.
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Old 04-24-2009, 15:48   #9 (permalink)
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Re: 5w-20 Or 10w-30 ?

Quote:
Originally Posted by mercdriver View Post
360ci, thanks on the info. So your saying that 5w-20 is okay for here in south texas when it get to about 100 + degrees in the summer (10w-30 wouldnt make any difference) and you recommend full syn instead of blend?
art
I'd stick will full synthetic. The only reason why I wouldn't run synthetic is if the vehicle in question ate more than 1qt of oil within 3K of driving. Synthetic lowers friction, which can mean longer engine life, and in some instances, increased mileage.
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Old 05-02-2009, 06:43   #10 (permalink)
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Re: 5w-20 Or 10w-30 ?

Well I finally did it. Went to 5W-20 Full synthetic- Mobile 1. It took 6 quarts total.
Before I went to full I bought a quart of oil flush, ran it for five minutes with a cold engine as stated. I really didnt see any gunk come out but the color of the previous regular oil was darker. this engine has 46 k miles on it , the inside of the oil cap where the rockers etc are looked pretty clean - no gunk at all and probably didnt need the flush. I dont know if it would or should be a good idea to flush before oil changes. I also dont know if I should now change every 5k miles. I used to always change at 2.5 or 3k on my previous marquis since I had lots of idle time smoking in it, I dont smoke in this grand marquis.
thanks for all of your inputs.
art
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