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#4503021 - 08/31/17 06:56 AM Shell Rotella 30w T1 Orange exhaust residue
Sepress1 Offline


Registered: 08/22/17
Posts: 3
Loc: Wisconsin, USA
I am experimenting with this oil in air cooled warm/hot weather engines. I am noticing an orange or tan, but more orange, residue around exhaust area of test equipment. Never seen anything like this with any other oil. Thoughts?
New here as you can see, so I appreciate any patience required.

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#4503033 - 08/31/17 07:16 AM Re: Shell Rotella 30w T1 Orange exhaust residue [Re: Sepress1]
PimTac Online   content


Registered: 03/04/17
Posts: 4325
Loc: Soviet State of Washington
Could it be the fuel? Many years ago, some local off brand stations in my area were selling gasoline with a reddish hue. The explanation was that the refinery which was local also used a certain clay type of filtering. It left a reddish orange color on carburetor parts and exhaust also if you used it often.

The oil could only be blamed if your engine is burning it but with that color I would bet on the fuel.

Any additives in the fuel?
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2017 Mazda CX-5 Grand Touring

Valvoline Advanced Synthetic 0w20
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#4503045 - 08/31/17 07:35 AM Re: Shell Rotella 30w T1 Orange exhaust residue [Re: Sepress1]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Octane booster will leave an orange/red residue.
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Acura Tech
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#4503136 - 08/31/17 09:07 AM Re: Shell Rotella 30w T1 Orange exhaust residue [Re: Sepress1]
ironman_gq Offline


Registered: 04/30/14
Posts: 604
Loc: MN
Any chance it's flash corrosion?

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#4503191 - 08/31/17 10:08 AM Re: Shell Rotella 30w T1 Orange exhaust residue [Re: Sepress1]
Sepress1 Offline


Registered: 08/22/17
Posts: 3
Loc: Wisconsin, USA
"Sea Foam" is only additive. i will try pure fuel from a different brand.

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#4503296 - 08/31/17 11:59 AM Re: Shell Rotella 30w T1 Orange exhaust residue [Re: Sepress1]
Kamele0N Online   sick


Registered: 02/09/15
Posts: 2045
Loc: Slovenia
Red or yellow tan on a muffler often shows that gasoline was not sulphur free....
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2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
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#4503602 - 08/31/17 05:22 PM Re: Shell Rotella 30w T1 Orange exhaust residue [Re: Sepress1]
LeakySeals Offline


Registered: 02/18/11
Posts: 6578
Loc: Hudson, NH
The inside of my Escalade tailpipe is orange. From rust. No carbon to protect it. No oil consumption at all
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06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
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#4503718 - 08/31/17 07:04 PM Re: Shell Rotella 30w T1 Orange exhaust residue [Re: LeakySeals]
passgas55 Offline


Registered: 09/26/04
Posts: 90
Loc: South La
It is a shame Shell would at least put an SL rating on T1. I had a brand new mower and did not get the Shell 30wt because of it.
I can't see where this would cost them a lot of money.

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#4505352 - 09/02/17 11:23 AM Re: Shell Rotella 30w T1 Orange exhaust residue [Re: Sepress1]
Sepress1 Offline


Registered: 08/22/17
Posts: 3
Loc: Wisconsin, USA
interestingly, the fuel was regular grade from a Shell station

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