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Unexplained slight rise in oil level #5436999 05/23/20 08:19 PM
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Idlewild294 Offline OP
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After I change the oil in my 17 Tundra, my dipstick usually shows around 7/8 towards the full mark, and shortly after my 45,000 mile change, it also showed somewhere around the 7/8 mark after a new Toyota filter and 8 quarts of Mobil 1 (I even tried to get every drop out of the Mobil 1 containers to see if I could get it closer to the full level), now at around 46,200 miles my oil level is right at the full level. The manual states to wait at least 5 minutes after shutting the vehicle off before checking the level. I’ve found my best readings are 15 min after shut down or after sitting overnight. Each time I check it, I’m in my garage on level ground. My coolant level appears unchanged since oil change, there is no noticeable smell of fuel on the dipstick, and overall the oil appears perfectly normal. Is it possible for several ounces of oil to get suspended somewhere or hung up and then released at the next drive? I’ve never sent in a sample to Blackstone, but I’ve ordered one this time. Anyone else ever experienced any unexplained oil level fluctuation like this?

Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437000 05/23/20 08:20 PM
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blufeb95 Offline
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Fuel Dilution

Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437004 05/23/20 08:27 PM
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klt1986 Offline
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Probably is some fuel dilution going on. I have not experienced this on my 2011 5.7L Tundra but it is one of the reasons I switched over to a 5w-30 oil.

Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437008 05/23/20 08:30 PM
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Idlewild294 Offline OP
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That’s my concern, I drive mostly highway miles, but I did idle for an hour or so recently while working on a radio and short tripped it more than usual. Will extended highway driving at 75 mph burn down any excess fuel in the oil? I’ve read conflicting reports on if fuel can be burned off like condensation can. Also, should I change it sooner than the 5,000 mile interval for this change?

Last edited by Idlewild294; 05/23/20 08:52 PM.
Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437025 05/23/20 08:58 PM
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Originally Posted by Idlewild294
That’s my concern, I drive mostly highway miles, but I did idle for an hour or so recently while working on a radio and short tripped it more than usual. Will extended highway driving at 75 mph burn down any excess fuel in the oil? I’ve read conflicting reports on if fuel can be burned off like condensation can. Also, should I change it sooner than the 5,000 mile interval for this change?

A UOA that uses gas chromatography to check for fuel dilution would tell you for sure.


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Kendall GT-1 Max + Ultra]
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Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437041 05/23/20 09:16 PM
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tcp71 Offline
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Fuel dilution is generally from direct injection. Is Toyota’s 5.7 direct injection? If not, I would think just normal variance and parking slope or something. 7/8ths or full...to close to all.


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Re: Unexplained slight rise in oil level [Re: tcp71] #5437045 05/23/20 09:20 PM
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buster Offline
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Originally Posted by tcp71
Fuel dilution is generally from direct injection. Is Toyota’s 5.7 direct injection? If not, I would think just normal variance and parking slope or something. 7/8ths or full...to close to all.


That's what I'm thinking. I know in my car it specifically states to wait at least 5 minutes until engine has been shutdown. However, waiting as much as 30-60 minutes will give you a different result than waiting just 5 minutes. Some engines are more finicky.


2020 - Mazda CX-30 - Mobil 1 EP 0w20
2019 - Subaru Impreza - Dealer Oil
Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437073 05/23/20 10:08 PM
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PowerSurge Offline
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I doubt you have a problem. Sounds like too much idling and short tripping. If you can’t smell gas in the oil on the dipstick I wouldn’t worry about it. These engines aren’t direct injected.

Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437085 05/23/20 10:27 PM
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jqgz Offline
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Originally Posted by Idlewild294
That’s my concern, I drive mostly highway miles, but I did idle for an hour or so recently while working on a radio and short tripped it more than usual. Will extended highway driving at 75 mph burn down any excess fuel in the oil? I’ve read conflicting reports on if fuel can be burned off like condensation can. Also, should I change it sooner than the 5,000 mile interval for this change?


Gasoline boils at 250° ish, so likely not.

Re: Unexplained slight rise in oil level [Re: jqgz] #5437111 05/23/20 11:12 PM
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PowerSurge Offline
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Originally Posted by jqgz
Originally Posted by Idlewild294
That’s my concern, I drive mostly highway miles, but I did idle for an hour or so recently while working on a radio and short tripped it more than usual. Will extended highway driving at 75 mph burn down any excess fuel in the oil? I’ve read conflicting reports on if fuel can be burned off like condensation can. Also, should I change it sooner than the 5,000 mile interval for this change?


Gasoline boils at 250° ish, so likely not.


It doesn’t need to boil.

Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437118 05/23/20 11:34 PM
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ripcord Offline
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I suspect that maybe the anti-drain back valve on your oil filter is not sealing well? This would seem to be a higher odds than a sudden increase in fuel dilution.

Re: Unexplained slight rise in oil level [Re: ripcord] #5437141 05/24/20 12:34 AM
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blufeb95 Offline
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Originally Posted by ripcord
I suspect that maybe the anti-drain back valve on your oil filter is not sealing well? This would seem to be a higher odds than a sudden increase in fuel dilution.

It's a cartridge I'd assume the ADBV would be a permenant part of the filter housing.

Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437230 05/24/20 06:53 AM
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You don't need to go 75mph and get a ticket. shocked2
leave it in S4 or S5 to get the higher RPM. In D, you will quickly end up in 6th.

I typically check my oil level a day later and in the same spot and haven't noticed much of increase and/or decrease even with the factory 0W20. However, I rarely short trip my truck as I have two other (commute and a spare) cars.

I can see why you are concerned ... but I have noticed some oil level fluctuation with our other cars especially with our only DI car. Tundra is MPFI.

The oil doesn't get too hot in this engine and most of them also have oil cooler. The rpm stays very low in D. I wish this car was a 5 spd. I would NEVER buy an 8 spd. or 10 spd. truck!

Put in in S4 and go for nice 45 min drive. keep the RPM between 3-4000 and see if it helps.
You may come back and say it now went a little below 7/8 and thinking you have a different problem. grin2

Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437236 05/24/20 07:02 AM
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demarpaint Offline
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It could be fuel dilution, I'd have a UOA done. I would also park in the garage and do two readings. The first reading, 15 minutes after shut down as you're doing, then another reading after the vehicle sits overnight and compare the levels. There should be no difference, if there is I'd go with the sitting overnight reading.


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Re: Unexplained slight rise in oil level [Re: Idlewild294] #5437267 05/24/20 08:07 AM
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Spector Offline
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It is fuel, I have it in both my cars.

Also, checking oil 15 min after stopping is okay but oil is still hot and not all of it have drained back down. Overnight is the most consistent for me although most people don's care as long as it is between the hash marks and thus, checking at any point is good enough.

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