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#1561975 - 08/11/09 12:24 PM Recommendations for a 2007 GMC Yukon XL 5.3?
TheOak Offline


Registered: 08/04/09
Posts: 52
Loc: Idaho, USA
I just put some AMSOIL 5W30 in my '05 Corolla (AMSOIL filter too).

Last gas fill was around 31.5 miles per gallon. I typically range around 31 point something to 32 point something.

To my surprise when I filled up I got 35.5 miles per gallon. This really surprise me as I have had the A/C cranked due to 95+ degree weather.

(For what it is worth, I always fill at the same gas station (Chevron), same grade (87), and stop filling at the first time it stops. Also, I have about 57k miles on the car. The past 20k have been Mobile 1 fully synthetic with whatever oil filter (probably Fram) that WalMart gives as default ... with 3 oil changes during.)

If this 35 miles per gallon keeps up is another story ... but I have rarely seen 35 even with a lot of highway.

Back to my Yukon XL ...

I just purchased my Yukon XL (used). It has just under 36K. So needless to say I have no choice but to think ... shoot ... if I get this kind of improvement with my Corolla, I would love to see the same on my Yukon XL that currently gets around 13 miles per gallon. If I can get it up to 14 or 15, I would be happy.

The wife uses the Yukon the most ... picking up kids, groceries. I doubt we will ever tow with the thing. Once a year we usually do a trek up to Vancouver BC from Boise Idaho. Summers here can get 105'ish ... over 95 for a good month or two. Winters as cold as the teens ... maybe 0 ... but norm is probably in the 20's.

I see that AMSOIL offers the 0W30 stuff too. I also hear a lot of buzz for 5W20 ... not sure if this is good for a truck application though ...

Recommendations?

(Thanks in advance!)
_________________________
'05 Corolla CE Automatic
Motor Oil: AMSOIL 5w30 ASL
Oil Filter: AMSOIL EAO09
Air Filter: Napa Gold/Wix
Transmission Oil: AMSOIL ATF

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#1561983 - 08/11/09 12:29 PM Re: Recommendations for a 2007 GMC Yukon XL 5.3? [Re: TheOak]
mrsilv04 Offline


Registered: 12/08/06
Posts: 7927
Loc: Illinois
A 10% increase in fuel economy on just oil is a little difficult to believe...

Something else is at work here. I'd say the fuel nozzle kicked off too early, and didn't get the car completely full on the last fill up.

If you want to eliminate another variable, start filling up using the same pump (and the same nozzle) every time.


I ran two changes of Amsoil 5w-30 in my 5.3 Silverado and saw little (if any) increase in fuel mileage over an easier to obtain oil such as Pennzoil Platinum.
_________________________
Ask me about my junk, knocking Jasper engine, that failed and had to be replaced at only 2,200 miles, and how poorly Jasper handled the claim.

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#1562003 - 08/11/09 12:47 PM Re: Recommendations for a 2007 GMC Yukon XL 5.3? [Re: mrsilv04]
Eddie Offline


Registered: 12/07/03
Posts: 9112
Loc: Florida, Cape Coral
Me thinks you also need to run out 4 or 5 full tanks to get a statically meaningfull number. An increase of 10% is not believable.
_________________________
CX5 Touring 2.5L :-)

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#1562050 - 08/11/09 01:23 PM Re: Recommendations for a 2007 GMC Yukon XL 5.3? [Re: Eddie]
hate2work Offline


Registered: 09/04/08
Posts: 4617
Loc: Western Washington

Amsoil makes good oil and would work well in your Yukon.

Don't look for that 10% mileage gain in your GMC, or to be sustained in your Corolla.
_________________________

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#1562136 - 08/11/09 02:30 PM Re: Recommendations for a 2007 GMC Yukon XL 5.3? [Re: hate2work]
TheOak Offline


Registered: 08/04/09
Posts: 52
Loc: Idaho, USA
Like I said ... I kind of doubt the 35 miles per gallon will keep up for all of the variables that folks here mention. It could be my car is in the "honeymoon" phase of new oil ... who knows ... time will tell. First impressions though are real good.

By the sounds of it though 5W30 for my Yukon.

Thanks ...
_________________________
'05 Corolla CE Automatic
Motor Oil: AMSOIL 5w30 ASL
Oil Filter: AMSOIL EAO09
Air Filter: Napa Gold/Wix
Transmission Oil: AMSOIL ATF

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#1562189 - 08/11/09 03:03 PM Re: Recommendations for a 2007 GMC Yukon XL 5.3? [Re: TheOak]
Alex38 Offline


Registered: 04/16/09
Posts: 515
Loc: Curtice, OH
I'd go with 5w30 in that Yukon, and any name brand dino or synthetic would be just fine. I'd probably run synthetic in the winter to ease cold starts, and good dino (GTX, PYB, etc.) in the summer.
_________________________
2009 Ford Taurus X: 5w20 Valvoline SynPower
2012 Ram 1500 HEMI: 0w30 M1 AFE
2012 F-250 6.7 Powerstroke: 10w30 Rotella T5

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