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Discussion Starter #1
Should spark plugs be changed by time or just mileage at 105k?

Additionally how about radiator fluid? What frequency or time should it be flushed?


Thank you
 

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i believe this is all in the owners maintenance manual that should have come with the vehicle. I wouldnt change the plugs until over 100K miles. It's not like metal and ceramic are perishable like a rubber timing belt due to time). I believe the coolant change interval is 8 years....so you can save that for next year. Of course nothing stops you from opening up the radiator cap and having a look-see and if you dont like what you see, you change out now.
 

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Spark plugs are every 30k on the pre 2010 models. Since your FJ is a 2012 they changed the spark plugs they use and they can go for longer durations. 100k IIRC.

Coolant is supposed to be every 100k also.

View attachment maintenance-schedule-chart-fj.pdf
 

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Discussion Starter #4
i believe this is all in the owners maintenance manual that should have come with the vehicle. I wouldnt change the plugs until over 100K miles. It's not like metal and ceramic are perishable like a rubber timing belt due to time). I believe the coolant change interval is 8 years....so you can save that for next year. Of course nothing stops you from opening up the radiator cap and having a look-see and if you dont like what you see, you change out now.
i have the owners manual, didnt see it there

Is there a separate maintenance schedule booklet?

Then i will look again

Fluid looks good red/pink. Will await to change plugss per your recommendation
 

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i have the owners manual, didnt see it there

Is there a separate maintenance schedule booklet?

Then i will look again

Fluid looks good red/pink. Will await to change plugss per your recommendation
Of course things could have changed by 2012, but the items that I received when I bought my 2010 new were:

  • Owner's Manual (436 pgs).
  • Quick Reference Guide (21 pages). Basically a quick guide for people that don't read owners manual.
  • Owner's Warranty Rights Notification (56 pgs).
  • Warranty and Maintenance Guide (64 pgs). This contains the maintenance interval information and has maintenance logs, etc.
EDIT: just looked it up in Warranty and Maintenance Guide. Coolant replacement is 100k miles or 120 months (not the 8 years I had specified). Spark Plug change interval is 120k miles or 144 months. This is for my 2010. I suspect 2012 is exactly the same as 2010.
 

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I usually try to stick to the recommended intervals. Somehow the plugs in our 2007 FJ slipped by us until a few weeks ago. About 110K, and the plugs were original - different brands on different sides as it came from the factory.

We had no driveability problems, but the gaps were HUGE - probably triple the spec. It does idle better - I had to relearn that I cannot feel the engine running at the stoplights!

Coolant done years ago.

Matt B
 

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Discussion Starter #8
Of course things could have changed by 2012, but the items that I received when I bought my 2010 new were:

  • Owner's Manual (436 pgs).
  • Quick Reference Guide (21 pages). Basically a quick guide for people that don't read owners manual.
  • Owner's Warranty Rights Notification (56 pgs).
  • Warranty and Maintenance Guide (64 pgs). This contains the maintenance interval information and has maintenance logs, etc.
EDIT: just looked it up in Warranty and Maintenance Guide. Coolant replacement is 100k miles or 120 months (not the 8 years I had specified). Spark Plug change interval is 120k miles or 144 months. This is for my 2010. I suspect 2012 is exactly the same as 2010.
Thank you so much. After reading your thread went through the car front and back, and found all the paperwork hiding in the seat pocket behind pass seat!!
 

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Discussion Starter #9
I usually try to stick to the recommended intervals. Somehow the plugs in our 2007 FJ slipped by us until a few weeks ago. About 110K, and the plugs were original - different brands on different sides as it came from the factory.

We had no driveability problems, but the gaps were HUGE - probably triple the spec. It does idle better - I had to relearn that I cannot feel the engine running at the stoplights!

Coolant done years ago.

Matt B
So I will shoot to change the plugs and radiator fluid at 100K.

Trans was changed last year. Diff/Transfer case I will try to do it now, as been doing that every 30K.
 

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I change my plugs every two years and I drain a gallon on fluid and refill with new fluid every year <img src="http://www.fjcruiserforums.com/forums/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />
drain and fill for radiator, no flush?
 

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So I will shoot to change the plugs and radiator fluid at 100K.

Trans was changed last year. Diff/Transfer case I will try to do it now, as been doing that every 30K.
Everybody has their own ideas, but if you look at optional heavy usage/offroad usage maintenance schedule, Toyota recommends changing front diff, rear diff and transfer case fluid every 30k miles. I have been sticking with that schedule. I am using Redline 75W-85 full synthetic gear oil for F&R diffs and Mobil 1 75W-90 full synthetic gear oil for transfer case. I do a pan drain/replace of transmission fluid every year as well to keep fresh. I am using Valvoline Maxlife ATF which is compatible with all my vehicles including Toyota. Certainly no problem using the Toyota fluids....they just get pricey...esp from my dealer that adds additional markup above list.

Plenty of threads to read about using 75W-140 synthetic or 85W-140 dino gear oil for F&R differentials for those that wheel their equipment a lot.

I use Mobil 1 0W-30 full synthetic for engine oil changes. I am not a big fan of 0W-20 weight that Toyota recommends for 2010+ FJs as I feel this was merely for fuel economy and it doesnt protect as well in high temps as a 30 weight oil. The '07-09 motors used 5W-30 engine oil.

Frankly, I think the key ingredient is to keep the fluids fresh and I probably change them too frequently. Use whatever brand names you like that also meet the specs. I would rather change too frequently than the other way around.
 

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Everybody has their own ideas, but if you look at optional heavy usage/offroad usage maintenance schedule, Toyota recommends changing front diff, rear diff and transfer case fluid every 30k miles. I have been sticking with that schedule. I am using Redline 75W-85 full synthetic gear oil for F&R diffs and Mobil 1 75W-90 full synthetic gear oil for transfer case. I do a pan drain/replace of transmission fluid every year as well to keep fresh. I am using Valvoline Maxlife ATF which is compatible with all my vehicles including Toyota. Certainly no problem using the Toyota fluids....they just get pricey...esp from my dealer that adds additional markup above list.

Plenty of threads to read about using 75W-140 synthetic or 85W-140 dino gear oil for F&R differentials for those that wheel their equipment a lot.

I use Mobil 1 0W-30 full synthetic for engine oil changes. I am not a big fan of 0W-20 weight that Toyota recommends for 2010+ FJs as I feel this was merely for fuel economy and it doesnt protect as well in high temps as a 30 weight oil. The '07-09 motors used 5W-30 engine oil.

Frankly, I think the key ingredient is to keep the fluids fresh and I probably change them too frequently. Use whatever brand names you like that also meet the specs. I would rather change too frequently than the other way around.
I just wanted to say a genuine thank you to you. You are one of THE most helpful and courteous members on this forum. In this new day of internet, people like you are rare. Big thanks from a new FJ owner. MUCH MUCH appreciated.

I will stick with the 30K diff/transfer fluid schedule car has been on. Additionally, I will stick with your redline/mobile 1 recommendations. So the transfer case calls for a diff oil grade then the F&R diffs? I looked through records on Toyota owners site, seems like Trans fluid was done 17K miles ago. So I will drive it this year, and do it then.

I will get the Mobil 1 ow-30. I run 5w40 and 20 weight in some other cars in the fleet, but will switch the FJ to the 30 as you recommended.

Thank you kindly.
 

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I just wanted to say a genuine thank you to you. You are one of THE most helpful and courteous members on this forum. In this new day of internet, people like you are rare. Big thanks from a new FJ owner. MUCH MUCH appreciated.

I will stick with the 30K diff/transfer fluid schedule car has been on. Additionally, I will stick with your redline/mobile 1 recommendations. So the transfer case calls for a diff oil grade then the F&R diffs? I looked through records on Toyota owners site, seems like Trans fluid was done 17K miles ago. So I will drive it this year, and do it then.

I will get the Mobil 1 ow-30. I run 5w40 and 20 weight in some other cars in the fleet, but will switch the FJ to the 30 as you recommended.

Thank you kindly.
YW.

Take a look at the specifications section of the owners manual. For 2010 models -- F&R differentials it indicates 75W-85 GL-5 Equivalent. Very few make a 75W-85 gear oil. Both Redline does and Toyota does. So I decided to go with Redline. For the transfer case Toyota recommends 75W. I think only Toyota makes a 75W gear oil. Most common is 75W-90 in synthetic....so I use the Mobil 1 75W-90 synthetic gear oil for transfer case.

Plenty of folks use the exact same 75W-90 synthetic gear for F&R diff and transfer case. That's what I use for daughter's '99 4Runner. No issues using those and when I last changed, frankly it came out looking almost new from all three after 30k miles. And she wheels her 4Runner a lot harder than I do my FJ (because Dad can fix it if she breaks it).

On engine oil, keep in mind that it rarely gets above 90-95 here in the front range of Colorado and rarely above 80 in the mountains, so 0W-30 does the job out here. If you are running in the deserts in CA, you might want to run the Mobil 1 0W-40 or 5W-40. Mobile 1 0W-20, 0W-30, 0W-40 are all available at my local Walmart for about $23 for 5 qts.
 

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Mine is a 2012 TT. I change plugs (Toyota Brand), radiator fluid (Toyota brand) and tranny fluid (Toyota brand) at 90k-100k. Oil every 6k-7-k, Castrol synthetic 5-30, with Lucas synthetic oil stabilizer. Diffs and transfer case 80k-90k with Lucas Synthetic. Over 200k about 1/3 of that mileage off road roaming deserts of So. Cal. Vehicle has been bullet proof, and yes no mods, don't need em.
 

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drain and fill for radiator, no flush?
I have drained the entire system before now I just drain a gallon out and replace it every year. I keep my fluids so clean I don`t need to do anything extreme to it. I probly over maintenance my FJ a bit but its got to last another 30 to 40 years so its worth it to me. :)
 

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Discussion Starter #17
5/30/2019 Just finished all the work all day today.

Big thanks to @Don T and @DucRider for all the help and information. Big thanks to @Irving Zisman for the trick on the plugs. Big thanks to @SilvFx and @Iconic_ and @Sanderhawk for all the information as well.

  • New OEM Sparkplugs
  • 5 Tire rotation
  • Front Diff Fluid
  • Rear Diff Fluid
  • Transfer Case
  • Transmission Drain and Fill
  • Power Steering Flush
 
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