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#4726711 - 04/14/18 12:32 PM
Top off oil ?
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Registered: 02/19/08
Posts: 1005
Loc: MA.
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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?
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#4726717 - 04/14/18 12:38 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 03/18/18
Posts: 120
Loc: Mississippi
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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.
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'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
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#4726736 - 04/14/18 12:50 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 01/24/08
Posts: 9748
Loc: OH
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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.
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2012 Toyota Camry 72k-Idemitsu 0w20,OEM filter, RT43s. 2005 Toyota Matrix 135k miles - VWB 5w30 conv, Valvoline oil filter. Nokian eNTYRES.
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#4726740 - 04/14/18 12:54 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 02/09/15
Posts: 1945
Loc: Slovenia
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Nope everything is ok...just try to top off with similar oil base (mineral/semisyn/syn) and weight
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2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40 1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40
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#4726761 - 04/14/18 01:21 PM
Re: Top off oil ?
[Re: Kamele0N]
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Registered: 05/31/02
Posts: 1106
Loc: St. Peters, Missouri
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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?
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#4726764 - 04/14/18 01:24 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 09/26/14
Posts: 1869
Loc: US-WA
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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.
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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
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#4726787 - 04/14/18 02:02 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 07/08/12
Posts: 1807
Loc: Nashville, TN via Memphis
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It's gonna blow up.
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16 WRX - PPPP 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
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#4726792 - 04/14/18 02:11 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 10/22/15
Posts: 2324
Loc: Balearic Islands , Spain
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In my Peugeot i have 5 different oils, of 2 different viscosities mixed in, and nothing has blown up 
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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.
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#4726795 - 04/14/18 02:15 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 04/13/13
Posts: 2174
Loc: The Northeast
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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.
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2018 Hyundai Elantra VE -- 3K 2013 Honda Pilot EX-L 4WD -- 55K 2002 Honda Accord EX-L -- 210K 2002 Infiniti I35 -- 130K
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#4726817 - 04/14/18 02:36 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 03/20/08
Posts: 5853
Loc: USA
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#4726889 - 04/14/18 03:45 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 07/27/13
Posts: 2020
Loc: Outer Banks, NC
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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.
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"What is it, the first hole I dug?" 2017 Honda Odyssey SE 2013 Honda Accord LX 2007 Honda Ridgeline RTS 2007 Infiniti M35
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#4726924 - 04/14/18 04:17 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 10/09/14
Posts: 10555
Loc: Idaho
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Oil is oil there all use the same additives. What chemistry is there to mess up.
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Artificial intelligence is no match for natural stupidity, we shall prevail
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#4727008 - 04/14/18 06:36 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 09/06/15
Posts: 5240
Loc: Kalifornia Kollective
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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 ...
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
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#4727039 - 04/14/18 07:11 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 10/09/04
Posts: 5665
Loc: Durango, Co
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I have some old sm Napa syn From a broken case I carry around for top up. Lasting forever..
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2018 Trd Pro 4Runner M1 0w40 2018 Tacoma off-road breaking in!
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#4727044 - 04/14/18 07:16 PM
Re: Top off oil ?
[Re: Camprunner]
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Registered: 12/24/11
Posts: 3672
Loc: North Carolina
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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.
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"Zed's dead baby, Zed's dead."
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