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Toyota Oil Loss (3.3L) #5243496 10/18/19 02:46 PM
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MaximaGuy Offline OP
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The Highlander In signature just experienced a huge oil loss of over 2Q over a 7.5K OCI. The vehicle has had synthetic all throughout on a 7.5K 5W30 OCI.

Usual oil loss was 1Q over the OCI but this was dramatic loss and concerning too.

Recent changes have been HM synthetic 15K miles ago and the PCV ic cleaned every 30K miles. Also last oil change added 8oz of Seafoam to the engine oil.

Any thoughts/suggestions


2018 MB GLE350
2011 Lexus ES350
2006 Toyota Highlander 4WD
Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243505 10/18/19 02:53 PM
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atikovi Online Content
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Most people would be tickled pink if their engine only used 2 quarts in 7,500 miles on a 13 year old engine. Read the A4 post where the 2014 Audi uses 1 quart in 1,000 miles.

Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243507 10/18/19 02:55 PM
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CharlieBauer Offline
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Is PCV cleaning a recommended operation? Some PCV's should not be replaced once removed.

Was there a reason for putting in Seafoam? Could that have caused the oil loss?


It ain't what you don't know that gets you into trouble. It's what you know for sure that ain't so.

- mistakenly attributed to Mark Twain
Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243512 10/18/19 02:58 PM
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MaximaGuy Offline OP
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Thanks but your response isn’t helpful.

German auto engineering in my mind is just OK - they don’t standup to Japanese makers ever.


2018 MB GLE350
2011 Lexus ES350
2006 Toyota Highlander 4WD
Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243519 10/18/19 03:07 PM
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Cujet Offline
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How many miles on it? Since you've run synthetic since new, it's unlikely to have clogged oil drain holes in the pistons. It's more likely to simply have lost some ring seal over all this time. As I'm sure you know, most modern engines have low tension piston rings that eventually fail to seal as well after some level of use. This has been a Toyota and Honda/Acura hallmark for well over a decade.

If it's not PCV related, try switching brands of oil.

I can't imagine the Seafoam was in any way helpful on an engine that has had synthetic since new. I dislike any form of oil dilution.

Have you looked for blowby?

Last edited by Cujet; 10/18/19 03:09 PM.

People who count on their fingers should maintain a discreet silence.
Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243521 10/18/19 03:08 PM
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JMJNet Offline
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I will try it without Seafoam and see if the oil is still burning?


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243525 10/18/19 03:14 PM
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edwardh1 Offline
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my 3.3 at 175000 miles has never had pcv cleaned or changed. Dino only 1/2 of a quart at 5000 oci


These products are all new every year?? They are a revolution!!! Razor blades, mens shirts, TVs, wiper blades, gutter guards, hearing aids... according to the ads. But also all new last year
Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243529 10/18/19 03:18 PM
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JohnnyJohnson Online Content
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Originally Posted by MaximaGuy
The Highlander In signature just experienced a huge oil loss of over 2Q over a 7.5K OCI. The vehicle has had synthetic all throughout on a 7.5K 5W30 OCI.

Usual oil loss was 1Q over the OCI but this was dramatic loss and concerning too.

Recent changes have been HM synthetic 15K miles ago and the PCV ic cleaned every 30K miles. Also last oil change added 8oz of Seafoam to the engine oil.

Any thoughts/suggestions





Per Seafoam instructions!

Note:
Though Sea Foam can be added at any time between oil change intervals, we recommend adding Sea Foam to an oil crankcase 100 to 300 drive miles before changing oil and filter.


2004 Corolla 136950
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 76703
Out: T6 5W-40 XG9100 73705
In: Rotella Dino PH9100 11-3-19
Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243534 10/18/19 03:27 PM
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wdn Offline
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OK Here's Japanese then: Subaru considers lost of one quart per 1,000 miles to be within "normal specifications."

Of course a Subaru is no Toyota.

Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243542 10/18/19 03:37 PM
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wdn Offline
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My Gen 1 Toyota Tundra with the 2UZ-FE V8 engine, currently with 158K miles on it, has never had the PCV replaced nor removed and it uses no oil whatsoever between oil changes. The dipstick reads right at Full right before I change it, just as it was when I last replaced the oil & filter.

Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243546 10/18/19 03:41 PM
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ad244 Offline
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If you're really concerned, try replacing the PCV

Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243550 10/18/19 03:44 PM
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michaelluscher Offline
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That's odd to hear

My '06 3MZ-FE in the Camry (identical to your Highlander) doesn't use any oil even at it's currently 132k

I'd check the PCV valve in the rear valve cover, you can swap it with a 19mm open ended box wrench, without pulling the manifold

Get a Genuine Toyota one, it's ~$8

Are you leaking any oil?


2006 Toyota Camry SE V6

131k
Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243598 10/18/19 05:19 PM
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Ded Mazai Offline
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As I understand the only difference was Seafoam which stayed in the engine for the OCI. All the cleaners should be used for a short time to soften the deposits. In the long run the cleaners tend to redeposit whatever was cleaned up. I would try a 5-10 minute flush.

Re: Toyota Oil Loss (3.3L) [Re: MaximaGuy] #5243599 10/18/19 05:21 PM
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maxdustington Offline
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Italian tune up. Additives or swapping the PCV that you know is good is a bad idea. Italian tune up = $0.


97 GMC RCLB K2500LD L30/4L60
99 Toyota Tercel CE 5EFE/C151
Re: Toyota Oil Loss (3.3L) [Re: atikovi] #5243631 10/18/19 06:00 PM
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Gebo Offline
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Dump the current oil and run another OCI without the Seafoam and install a new Toyota PCV.
Originally Posted by atikovi
Most people would be tickled pink if their engine only used 2 quarts in 7,500 miles on a 13 year old engine. Read the A4 post where the 2014 Audi uses 1 quart in 1,000 miles.



Well, I'm not most grin2


The only car in my sig that uses any oil is the '98 LS400 with 300K and it may use a pint in 3K.

My old 2000 GS300 with was the biggest oil drinker I had and it did 1/2 qt at 5K.


'98 LEX LS400 300K
'02 4Runner 245K
'05 Lex LS430 85K
'07 Lex GX470 65K

Shell Gas and Truck & Pennzoil Full Syn HM
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
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