amsoil 0w20 in tundra 4.7l

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jarmstrong

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whatcha think? maybe worth a mpg gain? its an 05 w/ vvt. currently using schaeffer's 5w30, 5k oci, and the wife gets 13mpg. i'd like to run the amsoil to 7500 to justify the cost and take samples. this truck doesn't tow much, maybe a 3k lb boat or hay ride wagon.
thanks
 
From the Amsoil site:

2005 TOYOTA TUNDRA 4.7L 8-cyl Engine Code 2UZ-FE

FILTERS
Oil Filter........ EAO57 AMSOIL Ea Oil Filter
Engine Oil
Grade 1......API*
Series 2000 Synthetic 0W-30 Motor Oil
SAE 5W-30 Synthetic Motor Oil
SAE 5W-30 XL Synthetic Motor Oil
All Temps......5W-30

It looks like Toyota does not list 0W20 for your vehicle, you are likely under warranty, so I would not recommend this oil. However, if I were you, I'd run the Amsoil EaO57 oil filter and the 5W30 oil for 15,000 warranted miles or 1 year whichever occurs first since you occasionally tow. I would guess maybe a 1% mpg increase. 15,000 miles at 13mpg would be 1154 gallons at $2.5/gallon and a 1% mpg increase would save you about $29 in gas. Not much, but you would also eliminate 2 of your current oil changes.
 
Tim gave you the good numbers. Maybe the oil would work fine, and it might even work better - but you would lose any warranty coverage you do have IF the oil viscosity caused an issue.

I'm not telling you to do this but it's your car, and if you want, try the ASM for 4K or so and do a UOA to see if wear metals come up. Then slowly increase the OCI.
 
Wow, I would not try it personely but I doubt it is going to harm it. If I did try what you are proposeing I would take a sample at 3000-4000 miles just to see how the wear metals are looking. We have plenty of UOA on this site of that model of engine so we have a good idea of what they normaly produce for a UOA! Even if the wear was accelerated slightly it is not going to be so bad as to cut the life of the engine short.TooSlick tried 0W20 Synergen and it did not work well in his Tacoma. I am sure though that his Tacoma is doing just fien. Think of it like this most dino oils from just a few years ago sheared badly and a 5W30 dino was usualy a 5W20 in 1500-3000 miles of use. The 2UZFE generaly produces insanely low wear numbers even with weak oils like Valvoline 5W30 dino. That engine has a low power density, good sump capacity and an excellent cooling sytem and oil cooler. I think it will be fine.
 
Just go with a thin 5W30. Castrol Syntec is 9.7 cSt and most of the others ~10.5 (like PP). The Amsoil 0W20 is 9.0 cSt so it really isn't that much thinner. Better to keep your warranty.
 
A conventional 5w30 will eventually shear down so its about the same thickness as Amsoil's 0w-20. The 0w-20 would start thin and stay thin, and you might save a bit of gas.
 
Quote:

A conventional 5w30 will eventually shear down so its about the same thickness as Amsoil's 0w-20.

Click to expand...


At the top end yes (hot viscosity) but it won't be anywhere close to the same viscosity as the 0w20 when cold. Eventually a conventional 5w30 will turn into a 10w20, not a 0w20.
 
i was the 13k OA in the tundra, i can tell you that whatever gain in MPG the thinner oil caused in pumping losses was lost in the weeds. i would say less than 3% if that. i am back to the M1 0w-40.
 
It might make a bit more piston slap noise when very cold, since it'll be thinner, as Patman mentioned. Though at 40 C, QS Winter Blend 5w30 is the same 50 cSt as Amsoil 0w20.
 
I would try a cheaper 5/w20 oil for a few thousand miles to see if there is an improvement in mpg before spending the big bucks for the syn.oil. Doubt it on any mpg improvments between syn and regular 0 or 5w/20 oil.
 
Quote:

From the Amsoil site:

2005 TOYOTA TUNDRA 4.7L 8-cyl Engine Code 2UZ-FE

FILTERS
Oil Filter........ EAO57 AMSOIL Ea Oil Filter
Engine Oil
Grade 1......API*
Series 2000 Synthetic 0W-30 Motor Oil
SAE 5W-30 Synthetic Motor Oil
SAE 5W-30 XL Synthetic Motor Oil
All Temps......5W-30

It looks like Toyota does not list 0W20 for your vehicle, you are likely under warranty, so I would not recommend this oil. However, if I were you, I'd run the Amsoil EaO57 oil filter and the 5W30 oil for 15,000 warranted miles or 1 year whichever occurs first since you occasionally tow. I would guess maybe a 1% mpg increase. 15,000 miles at 13mpg would be 1154 gallons at $2.5/gallon and a 1% mpg increase would save you about $29 in gas. Not much, but you would also eliminate 2 of your current oil changes.

Click to expand...
Tim where is it stated that Amsoil warrants their oil for any mileage.?
 
Steve - on the bottle, on the website, on the written warranty, on the product recommendation and change interval guide, on the tech data sheets, on product description sheets, on all the literature, in the catalogs. If you have a particular product in mind, I'll post the link.
 
Quote:

whatcha think? maybe worth a mpg gain? its an 05 w/ vvt. currently using schaeffer's 5w30, 5k oci, and the wife gets 13mpg. i'd like to run the amsoil to 7500 to justify the cost and take samples. this truck doesn't tow much, maybe a 3k lb boat or hay ride wagon.
thanks

Click to expand...


Have you done any UOAs with the Schaeffer 5W30? You should be able to run it 7500mi with no problem in that engine. The also make an excellent 5W20 but I think I would stay with the 5W30 in that engine.
 
The HT/HS viscosity of the shear stable, Amsoil 0w-20 is 2.8 Cp @ 150C. The minimum HT/HS viscosity for an SAE xw-30 is 2.9 Cp @ 150C. Therefore ALL domestic and Japanese engines are designed to run on oils as thin as 2.9 Cp with no abnormal wear. In addition to this, most petroleum based xw-30 oils shear down within the first 3000 miles of use.

The Amsoil 0w-20 will work just fine in this application - but I'd only expect a fuel saving of perhaps 2%-3%. I do think you'll get noticably easier starting in very cold weather and a more responsive engine during the warmup phase.

TS
 
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