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Hello everyone, my RX has almost a 100k on it so I am about to have the spark plugs replaced. I have also decided to replace all 6 coils since I think its smart to replace the rears while everything is apart. My question is, what is a good OEM spark plug and coils to purchase?
Due to how much work is needed to change the rear spark plugs I am going with the NGK LFR6AHX-S Ruthenium spark plugs that has a long service life and a stronger park for better engine performance/fuel economy.
I will also swap out the old rear coil packs for Denso 673-1309 coil packs and keep them as spare for the front coil packs; because my RX350 rear coil packs have over 180k miles on them and are hard to replace.
imho a bit early to replace [~20%]. 120K miles is what I think is the service recommendation for spark plugs. Coilpacks are failure based, but I agree that it falls under convenience/related service. If there are reasons [convenience, related service etc] then it can be done earlier or even soon after.
I plan to stick to what the local Lexus parts sells [this would cover Lexus updates].
Some have pulled plugs at 150,000 miles to find they were still good for many more thousands of miles. Point being that you do not need to change them now. As Salim stated - the factory maintenance schedule is 120,000 miles.
I DO NOT recommend doing this, but I sold my RX with 165,000 miles / almost 14 yrs on it still with the original plugs and coils (and pretty much everything else still 100% factory original except for the water pump). Still ran just fine and fuel economy and power felt as good as day 1, I just got a bit lazy and combined with all the pandemic stuff I just never got around to it at the time it was due and by the time I started to consider it again, I decided to move on instead. But my point is, I agree with other comments that the factory interval seems perfectly fine, if no issues, then there really is no incentive to do it early. If I was doing it, I would stick with OEM Lexus parts. If the first ones lasted 14 yrs and 165,000 miles completely issue free, why would I want something different. Worth it even if more than 3rd party stuff.
I DO NOT recommend doing this, but I sold my RX with 165,000 miles / almost 14 yrs on it still with the original plugs and coils (and pretty much everything else still 100% factory original except for the water pump). Still ran just fine and fuel economy and power felt as good as day 1, I just got a bit lazy and combined with all the pandemic stuff I just never got around to it at the time it was due and by the time I started to consider it again, I decided to move on instead. But my point is, I agree with other comments that the factory interval seems perfectly fine, if no issues, then there really is no incentive to do it early. If I was doing it, I would stick with OEM Lexus parts. If the first ones lasted 14 yrs and 165,000 miles completely issue free, why would I want something different. Worth it even if more than 3rd party stuff.
Our ES has 335k miles on it and the coils in back are original. I’ve never changed them when I did the spark plugs. Coils to me are a ‘failure’ item as mentioned. Granted I can take it home and deal with it, and not everyone has the luxury to be that independent of a mechanic’s services. So to me it’s a different answer:
- If you do your own work, do it when necessary.
- If you are dependent on mechanic’s service, swapping the hard-to-get ones at some point along with valve cover gaskets is likely a good idea (200k?)
- on the longitudinal V6 and V8, I never do it until failure, likewise the Volvo transverse 5s. I carry a couple low-mile take-off coils in the spare tire well of each car. Even if it goes bad far from home I can swap one in within a few minutes.
The spark plugs are good for 125k easy. I read an industry white paper where the Japanese engineers figured the interval on good Iridium plugs could be 200k.
I've lost count of how many times I've read about people replacing coils because "while you're in there" and ended up with misfires because they didn't use genuine parts.
I DO NOT recommend doing this, but I sold my RX with 165,000 miles / almost 14 yrs on it still with the original plugs and coils (and pretty much everything else still 100% factory original except for the water pump). Still ran just fine and fuel economy and power felt as good as day 1, I just got a bit lazy and combined with all the pandemic stuff I just never got around to it at the time it was due and by the time I started to consider it again, I decided to move on instead. But my point is, I agree with other comments that the factory interval seems perfectly fine, if no issues, then there really is no incentive to do it early. If I was doing it, I would stick with OEM Lexus parts. If the first ones lasted 14 yrs and 165,000 miles completely issue free, why would I want something different. Worth it even if more than 3rd party stuff.
Sound logic. My 2015 RX350 has over 180k miles and it still runs great with the original plugs(I believe), however the plugs could have be changed before I purchased it with 172K miles a year ago. Either way I tend to service my engines; so I will change out the plugs including the rear coils myself when the weather is warmer.
I may not use OEM plugs or coil packs, but I do use Toyota OEM supplier aftermarket brands like Denso and NGK for my replacements and never had an issue.
I've lost count of how many times I've read about people replacing coils because "while you're in there" and ended up with misfires because they didn't use genuine parts.
Interesting. So, these vehicles aren't the kind where you end up mangling 3 of the coils while trying to get at the plugs? If so, that's good to know.
3-Liter Ford Duratecs guarantee will need new coil packs during a plug change.
Interesting. So, these vehicles aren't the kind where you end up mangling 3 of the coils while trying to get at the plugs? If so, that's good to know.
3-Liter Ford Duratecs guarantee will need new coil packs during a plug change.
No. The plugs and coil-packs generally come out easy in the 3.5 V6. The issue is that you must remove the intake manifold or just the wiper cowl to get to the rear plugs/coil packs. Therefore, many owners just swap out the rear bank coil-packs during a spark plug change on high mileage 3.5 engines to prevent having to prematurely go back in after a spark plug change to replace an old worn out coil that may fail a few months later after putting in new spark plugs. Make sense.
Generally no issues occur with new aftermarket coils made by Denso(OEM Toyota supplier), however I would not go with any other aftermarket part company for coils. Denso or OEM only.
I've lost count of how many times I've read about people replacing coils because "while you're in there" and ended up with misfires because they didn't use genuine parts.
Generally the aftermarket Denso coil packs last just as long(no premature misfiring)as the same ones the company ships to Toyota to be used as OEM for a lesser price. However, I would not trust the wide assortment of lesser known brands of aftermarket coil packs that are cheaply available online. Denso or OEM(same company) coil packs only in my opinion.
Generally the aftermarket Denso coil packs last just as long(no premature misfiring)as the same ones the company ships to Toyota to be used as OEM for a lesser price. However, I would not trust the wide assortment of lesser known brands of aftermarket coil packs that are cheaply available online. Denso or OEM(same company) coil packs only in my opinion.
Well, I stand corrected. I just checked my current 2015 RX350 coil pack and the rear coil packs I saved from my 2007 Highlander 3.3V6 after its spark plug change. They all say Diamond. I have seen Denso OEM coil packs before on Toyota(and other makes) I believe, but you are correct that Diamond is the supplier for the RX350.
It seems that Denso supply some Toyota model coil packs buy not all. Hence I trust the brand as an replacement for my Toyota engines.
02-29-24, 05:58 PM
Need spark plug and coil recommendations
