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Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: Gasbuggy] #4943848 12/05/18 05:17 AM
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gfh77665 Offline
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Sir I salute you.

...And I am sure you salute her!

Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: Gasbuggy] #4943860 12/05/18 05:58 AM
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Gasbuggy Offline OP
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I was hoping my reply would be the first post of page 2 not the last of page 1. Oh well


Cadillac CTS-V 6.2L 10w30PP
Volvo P1800 Euro L
76 Mercedes 300D Rotella T4
Series III Land Rover VWB
02 Yukon 10w30 PP
01 P71 M1 EP-HM 0W20
95 Accord - 386k. Mobil 2 RIP
Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: Gasbuggy] #4945294 12/06/18 06:44 PM
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ChrisD46 Online Content
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I've used 1 oz. of Seafoam per quart of engine oil and ran for 100 miles or so before an oil change with no engine issues other than the dipstick was darker than before the Seafoam went in ... If it concerns you then ditch the Seafoam (but not the girl - she is a keeper !)


'17 Hyundai Sonata 2.4L GDI 5W30 Valvoline Advanced Syn / Fram Ultra
'10 Hyundai Elantra 2.0L 5W30 QSUD / Fram Ultra
'07 Kia Sedona 3.8L 5W30 M1 EP HM / Fram Ultra
Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: Gasbuggy] #4945749 12/07/18 09:55 AM
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Cute girl, I'd have used the CTS-V in your sig instead of that land yacht hunk of GM junk! lol.

Sea foam did what is was supposed to, darker oil meant it was cleaning and doing its job. However, I never use a thin grade oil when I plan to add a solvent based cleaner like Seafoam... you should go with a 15W40.


Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: joekingcorvette] #4945902 12/07/18 01:22 PM
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I have a 2002 Tahoe 5.3L with 237k miles. It's had piston slap since day one, though it only did it on cold starts. What worked for me was switching to an oil with high amounts of moly, especially tri-nuclear moly. I ran Amsoil Signature Series 10w-30 for a while, which has around 240 ppm, and it quieted down a good bit. I recently switched to Driven LS30 5w-30, a PAO/ester oil with around 400 ppm of tri-nuclear moly, and the piston slap is gone entirely. Even with it being 30*F out this morning with frost on the windshield, it still fired right up smooth and quiet.

Keep in mind that just because the oil turns darker doesn't mean it's cleaning. Oil turns black from oxidation. Seafoam is highly susceptible to oxidation. If you added seafoam to engine oil in a container and let it sit on a table for a few weeks, it would turn dark as well. The naphta and mineral spirits in Seafoam will attack the base oil (particularly nitrogen sites), turning the base oil black. It gives the illusion that it's working when in reality it's just smoke and mirrors. It affects the base oil in the same way as fuel dilution.

Unrelated to Seafoam, some ashless dispersants turn dark due to UV exposure (from combustion events) making the oil appear oxidized when it really isn't.

Last edited by RDY4WAR; 12/07/18 01:32 PM.

"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: Gasbuggy] #4945966 12/07/18 02:53 PM
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nicholas Offline
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Honestly - next time try BG EPR - - - It worked wonders cleaning the rings from our oil guzzling Audi.
Every used car we buy I throw in EPR - - - - -

I have used Seafoam - -through the intake, in the crank, in the gas.....we tried marvel mystery stuff. They all did nothing. IMO not worth the time and effort at all.

Give it a shot - - and come back to let us know.


2019 2.0T Santa Fe
2010 3.5 Santa Fe
Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: RDY4WAR] #4947021 12/09/18 02:17 AM
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Originally Posted by racin4ds
Cute girl, I'd have used the CTS-V in your sig instead of that land yacht hunk of GM junk! lol.

Sea foam did what is was supposed to, darker oil meant it was cleaning and doing its job. However, I never use a thin grade oil when I plan to add a solvent based cleaner like Seafoam... you should go with a 15W40.



Out of the whole list she only likes the Volvo and the Yukon.


Originally Posted by RDY4WAR
I have a 2002 Tahoe 5.3L with 237k miles. It's had piston slap since day one, though it only did it on cold starts. What worked for me was switching to an oil with high amounts of moly, especially tri-nuclear moly. I ran Amsoil Signature Series 10w-30 for a while, which has around 240 ppm, and it quieted down a good bit. I recently switched to Driven LS30 5w-30, a PAO/ester oil with around 400 ppm of tri-nuclear moly, and the piston slap is gone entirely. Even with it being 30*F out this morning with frost on the windshield, it still fired right up smooth and quiet.

Keep in mind that just because the oil turns darker doesn't mean it's cleaning. Oil turns black from oxidation. Seafoam is highly susceptible to oxidation. If you added seafoam to engine oil in a container and let it sit on a table for a few weeks, it would turn dark as well. The naphta and mineral spirits in Seafoam will attack the base oil (particularly nitrogen sites), turning the base oil black. It gives the illusion that it's working when in reality it's just smoke and mirrors. It affects the base oil in the same way as fuel dilution.

Unrelated to Seafoam, some ashless dispersants turn dark due to UV exposure (from combustion events) making the oil appear oxidized when it really isn't.




That is some GOOD information RDY4WAR. Can you ballpark how many miles you ran the Joe Gibbs oil before it stopped slapping on cold start?


Cadillac CTS-V 6.2L 10w30PP
Volvo P1800 Euro L
76 Mercedes 300D Rotella T4
Series III Land Rover VWB
02 Yukon 10w30 PP
01 P71 M1 EP-HM 0W20
95 Accord - 386k. Mobil 2 RIP
Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: Gasbuggy] #4949388 12/11/18 09:06 PM
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The Delvac should help a bit to quite GM's penny pinching quality. Also you are punching above your weight class. Good job.


make the inside of your engine oil cap white.
don't use.
Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: Gasbuggy] #4951487 12/14/18 01:39 AM
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RDY4WAR Online Content
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Originally Posted by Gasbuggy
Can you ballpark how many miles you ran the Joe Gibbs oil before it stopped slapping on cold start?


About 250 miles.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: Seemingly Negative Experience adding Seafoam to oil. 5.3 Yukon [Re: Gasbuggy] #4951506 12/14/18 02:37 AM
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It is the same observation with my mobil 1 oil, once it is diluted, performance degraded fast

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