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econdave 12-06-2007 06:28 AM

synthetic oil?
I have a 06 Tacoma with 20,000 miles. I am thinking about going to synthetic oil.

The reason being is my beater car is dying and I do a about 100 miles a day back and forth to work.

3,000 mile oil changes are to frequent. I would like to be able to drive more miles between oil changes.

NateHanson 12-06-2007 10:24 AM

My 06 Tundra specifies synthetic oil, and 5,000 mile service intervals. I'm suprised your Taco isn't the same??

econdave 12-06-2007 11:46 AM

Until recently I have brought my truck to the dealer for oil changes. Its a pain because the dealer is far from my house and you have to wait a few hours just to get a oil change.

I hear there is synthetic oil that would allow you to go 7,500 miles between oil changes.

slickshift 12-06-2007 08:00 PM

The increased miles in between oil changes, if any, due to synth oil, will be directly related to the engine and how it is driven

I have had four bangers that were "ideally" driven (warmed up in town-decent highway distance commute-no "city" harsh driving conditions) that after 8000 miles the synth looked better than the synth in the big eight cylinder with the 10-minute cold engine commute did at 2000

I suspect at 100 miles a day and with only 20K on the odo, you would be an idea candidate for synth

econdave 12-09-2007 11:18 AM

so in your opinion whats the best synthetic oil on the market?

slickshift 12-09-2007 04:43 PM

IMO it doesn't matter too much
It has to be a full synth...none of those "blends"
The oil is only as good as it's weakest link, so those "blends" are just to sell to people that don't want to spend the cash on full synth, but want to feel they are treating their engines better than regular oil
It just separates more cash from the consumer, doesn't really help the engine

And it should be the viscosity/weight that is recommended, or works better, for your engine
I say this because the different brands come in different weights, and not all are good for every engine
Using the two examples above:
The little Japanese four cylinder highway engine did great on the Castrol Syntec (5w-50)
The big old 302 drank that stuff like keg beer at a frat party
The juice was just too "slick" for the large tolerances of the larger, older American eight
However, Mobil 1, available in 10w-30 worked fine in that one

IMO it's best to find an oil in the factory recommended viscosity and then go from there (if need be)

econdave 12-09-2007 05:47 PM

so you say I should contact my dealer and ask them what synthetic oil I should use and what viscosity? I thank you for all your help and knowledge in this matter.

NothingsLevel 12-09-2007 07:58 PM

The dealer will just tell you to come in and have them do the oil changes with whatever they use.

Use the oil viscosity your owner's manual says to use. Can't go wrong with Mobil 1 IMO.

slickshift 12-09-2007 08:05 PM


Originally Posted by NothingsLevel (Post 79454)
Use the oil viscosity your owner's manual says to use.

That's what I was getting at
If the owner's manual say use a 5w-50, and Castrol has a 5w-50, but Mobil 1 has a 10w-30 and a 10w-40, use the Castrol
If the manual says use a 10w-40, and Castrol only has a 5w-50, use Mobil 1's 10w-40
Amsoil and Royal Purple also have good synthetic products

saltydevildog 12-24-2007 09:14 AM

I only run mobile 1 (pure synthetic), and change every 10 thousand, with K&N filters. The filters have a 1 inch nut on them and they are great (10.00 on amazon) I had 170 thou on last blazer, (traded to 07 grand caravan) and still going strong at 130 thou on 98 expedition. The oil looks great after 10 thou.

UBoiler 12-30-2007 12:23 AM

So I had a Amsoil sales rep at their product booth at the MN state fair tell me their synthetic oil shows no breakdown of viscosity at 25,000 miles. I said that's nice but what about all the debris and contaminants the oil picks up? He said the Amsoil oil filters need to replaced at 12,500.

I'm skeptical of most things so I haven't taken this guy's word; however I have over 350,000 miles on my 02 Silverado 1500 using the lowest priced 100% synthetic motor oil I can find and changing oil at 10,000 miles.
This model also gave me over 260,000 miles on my first set of front pads so IMO Chev did A VERY FINE JOB OF OVER_DESIGNING and I appreciate it. I had a stickiing rear pad so I didn't get such sensational results with my rear originals but the replacements are doing great!

If anyone has any info on my Amsoil tale or similar surprising luck with 02 Chev brake pad life I'd enjoy hearing about it. Thanks Cliff

jerryh3 12-30-2007 06:19 AM

I run amsoil in both my Maxima and CR-V with 10K change intervals.

jren 01-03-2008 06:01 AM

we use amsoil in our race motorcycles. prior to switching I'd do a complete rebuild twice a year. I switched because a customer brought in a motor and it looked brand new. I asked him why he sent a new motor to me. He told me it had 13 nationals on it. so i tried it out. I've extended my full rebuilds to a full year and increased topend life by 2X.

So I cannot speak for the auto motor oils but I would speak highly of their products in general.

slickshift 01-04-2008 07:18 AM


Originally Posted by UBoiler (Post 83829) 25,000 miles....what about all the debris and contaminants the oil picks up? ....filters need to replaced at 12,500.

Regardless of how well the oil itself is viscosity-wise, part of it's job is to flush out contaminants, which develop in any engine with any oil

Even if the oil's viscosity is still good at 10K, the filter could be suffering

For that reason extended change intervals reach a point of diminishing returns

Even if the oil still is tests good viscosity-wise, if you are under there changing a filter @ 10/12K, IMO might as well change the oil also

jren 01-04-2008 09:18 AM

I guess I sorta disagree. when you run 15quarts of oil like I do the difference between changing a filter and the oil is a big diff $$$wise. in a under 4 quart car I'd tend to agree though.

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