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#4726711 - 04/14/18 12:32 PM Top off oil ?
Camprunner Offline

Registered: 02/19/08
Posts: 1005
Loc: MA.
Do you think it really matters much if you use a different brand of top off oil other then what is in the sump? Let's say you are 4,000 miles into a 7,500 OCI and running QSUD 5w30 and add 1 quart of Motorcraft simi synthetic 5w30 Are you messing up the chemistry of the QSUD or after 4,000 miles does the chemistry of the QSUD even matter all that much?

#4726717 - 04/14/18 12:38 PM Re: Top off oil ? [Re: Camprunner]
TheLawnRanger Offline

Registered: 03/18/18
Posts: 120
Loc: Mississippi
I like to buy and extra quart of the oil that's already in my vehicles but it likely doesn't matter as long as it's quality oil. I think there was a similar post not to long ago.
'99 Cavalier 5w 30 SuperTech conventional
'11 Impala 5w 30 Magnatec full synthetic
'12 Colorado 5w 30 Magnatec full synthetic
*regular Wix oil filters for all

#4726736 - 04/14/18 12:50 PM Re: Top off oil ? [Re: Camprunner]
SatinSilver Offline

Registered: 01/24/08
Posts: 9748
Loc: OH
The only time it really matters is in the winter when you're trying to maintain a zero winter weight. In your situation it would be good since you're replenishing the additive pack. Plus the oil is less dirty in the sump.
2012 Toyota Camry 72k-Idemitsu 0w20,OEM filter, RT43s.
2005 Toyota Matrix 135k miles - VWB 5w30 conv, Valvoline oil filter. Nokian eNTYRES.

#4726740 - 04/14/18 12:54 PM Re: Top off oil ? [Re: Camprunner]
Kamele0N Offline

Registered: 02/09/15
Posts: 1945
Loc: Slovenia
Nope everything is ok...just try to top off with similar oil base (mineral/semisyn/syn) and weight
2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40

#4726761 - 04/14/18 01:21 PM Re: Top off oil ? [Re: Kamele0N]
csandste Offline

Registered: 05/31/02
Posts: 1106
Loc: St. Peters, Missouri
Originally Posted By: Kamele0N
Nope everything is ok...just try to top off with similar oil base (mineral/semisyn/syn) and weight

If you threw some syn on top of mineral wouldn't you get semisyn? Why would that be bad?

#4726764 - 04/14/18 01:24 PM Re: Top off oil ? [Re: Camprunner]
Dyusik Offline

Registered: 09/26/14
Posts: 1869
Loc: US-WA
Think of it this way, when you make the switch (couldn't help myself, sorry), you have about a top off's worth of oil in the engine. Now that is quantity, the quality of the remaining oil is the opposite of what you are about to do.
Still worried?
None of mine need topping off, the IS is finally fixed thanks to TSB, except for the HD. When I do top off, it's never the same, usually up a grade or two. With this manner, the more I top off, the less I need to. Your experiences may vary of course.
This is the perfect moment when the saying "oil is oil" applies.
95 Cherokee 190K DELO 10W30,XG8
07 IS250 96K FB ?w??,FULL
04 YZF-R1 18K DELO 15w40,XG7317
99 HD XL1200S 18K 76 20w50,1515
14 RX450h 30k PP 0w20,NAPAG

#4726787 - 04/14/18 02:02 PM Re: Top off oil ? [Re: Camprunner]
john_pifer Offline

Registered: 07/08/12
Posts: 1807
Loc: Nashville, TN via Memphis
It's gonna blow up.
07 Tacoma V6 - M1 EP 5W-30, Fram Ultra, 10K OCIs, 198K
07 Yamaha R1 - Rotella T6 5W-40, Bosch 3300
07 Yamaha YZ-250, Klotz, Rotella

#4726792 - 04/14/18 02:11 PM Re: Top off oil ? [Re: Camprunner]
FordCapriDriver Offline

Registered: 10/22/15
Posts: 2324
Loc: Balearic Islands , Spain
In my Peugeot i have 5 different oils, of 2 different viscosities mixed in, and nothing has blown up smile
1975 Ford Capri II Ghia 3000 V6
1988 Ford Escort 1.6 Xr3i Convertible
Finnish expat living in Spain
My clothes smell like 15W-40 HDEO and 20W-50.

#4726795 - 04/14/18 02:15 PM Re: Top off oil ? [Re: Camprunner]
mclasser Offline

Registered: 04/13/13
Posts: 2174
Loc: The Northeast
The most I do is top off a synthetic with another synthetic. I try to use the same weight but whatever I have on hand gets tossed in. Some oil is better than low oil, IMO.
2018 Hyundai Elantra VE -- 3K
2013 Honda Pilot EX-L 4WD -- 55K
2002 Honda Accord EX-L -- 210K
2002 Infiniti I35 -- 130K

#4726817 - 04/14/18 02:36 PM Re: Top off oil ? [Re: Camprunner]
slacktide_bitog Offline

Registered: 03/20/08
Posts: 5853
Loc: USA

#4726889 - 04/14/18 03:45 PM Re: Top off oil ? [Re: Camprunner]
NormanBuntz Offline

Registered: 07/27/13
Posts: 2020
Loc: Outer Banks, NC
For me, if your top off oil is the same API certification, I'll go thicker, not lighter, and use what I have handy or already opened. Everclear never.
"What is it, the first hole I dug?"
2017 Honda Odyssey SE
2013 Honda Accord LX
2007 Honda Ridgeline RTS
2007 Infiniti M35

#4726924 - 04/14/18 04:17 PM Re: Top off oil ? [Re: Camprunner]
CT8 Offline

Registered: 10/09/14
Posts: 10555
Loc: Idaho
Oil is oil there all use the same additives. What chemistry is there to mess up.
Artificial intelligence is no match for natural stupidity, we shall prevail

#4727008 - 04/14/18 06:36 PM Re: Top off oil ? [Re: Camprunner]
BrocLuno Offline

Registered: 09/06/15
Posts: 5240
Loc: Kalifornia Kollective
It does not matter. One of the primary functions of oil is to transfer heat. So more is better. Volume counts. Prolly more than trying to figure out if partially used chemistry will be negatively impacted ...
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

#4727039 - 04/14/18 07:11 PM Re: Top off oil ? [Re: Camprunner]
Bryanccfshr Offline

Registered: 10/09/04
Posts: 5665
Loc: Durango, Co
I have some old sm Napa syn From a broken case I carry around for top up. Lasting forever..
2018 Trd Pro 4Runner M1 0w40
2018 Tacoma off-road breaking in!

#4727044 - 04/14/18 07:16 PM Re: Top off oil ? [Re: Camprunner]
rooflessVW Offline

Registered: 12/24/11
Posts: 3672
Loc: North Carolina
I have a big jug with the label torn off and "EURO MIX" sharpied on the side.

It's a mix of Pennzoil, Mobil, and Castrol 0W-40 oils with a bit of HDEO. All my leftovers go in there and I use it to top off anything and everything.
"Zed's dead baby, Zed's dead."

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