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Top off oil ? #4726711
04/14/18 12:32 PM
04/14/18 12:32 PM
Joined: Feb 2008
Posts: 1,065
MA.
Camprunner Offline OP
Camprunner  Offline OP

Joined: Feb 2008
Posts: 1,065
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?

Re: Top off oil ? [Re: Camprunner] #4726717
04/14/18 12:38 PM
04/14/18 12:38 PM
Joined: Mar 2018
Posts: 952
Mississippi
TheLawnRanger Offline
TheLawnRanger  Offline

Joined: Mar 2018
Posts: 952
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.


2011 Impala
2012 Colorado
Oil: 5w30 synthetic
Filters: Wix 51522 for both
Re: Top off oil ? [Re: Camprunner] #4726736
04/14/18 12:50 PM
04/14/18 12:50 PM
Joined: Jan 2008
Posts: 11,257
OH
SatinSilver Offline
SatinSilver  Offline

Joined: Jan 2008
Posts: 11,257
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.

Re: Top off oil ? [Re: Camprunner] #4726740
04/14/18 12:54 PM
04/14/18 12:54 PM
Joined: Feb 2015
Posts: 2,595
Slovenia EU
Kamele0N Offline
Kamele0N  Offline

Joined: Feb 2015
Posts: 2,595
Slovenia EU
Nope everything is ok...just try to top off with similar oil base (mineral/semisyn/syn) and weight


2008 Toyota Yaris 1ND-TV 1.4 D4-D Elf FullTech FE 5w30
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10w40
Re: Top off oil ? [Re: Kamele0N] #4726761
04/14/18 01:21 PM
04/14/18 01:21 PM
Joined: May 2002
Posts: 1,775
St. Charles County, Missouri
csandste Offline
csandste  Offline

Joined: May 2002
Posts: 1,775
St. Charles County, 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?


2017 Kia Soul Plus-- VWB 5-30, 54,000 miles.
Re: Top off oil ? [Re: Camprunner] #4726764
04/14/18 01:24 PM
04/14/18 01:24 PM
Joined: Sep 2014
Posts: 2,205
US-WA
Dyusik Offline
Dyusik  Offline

Joined: Sep 2014
Posts: 2,205
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 106K STP syn HM 10w30, FULL
04 YZF-R1 19K DELO 15w40, XG7317
99 HD XL1200S 21K VR1 20w50, NG1515
14 RX450h 40k Idemitsu 0w20, 57047
Re: Top off oil ? [Re: Camprunner] #4726787
04/14/18 02:02 PM
04/14/18 02:02 PM
Joined: Jul 2012
Posts: 2,365
Nashville, TN via Memphis
john_pifer Offline
john_pifer  Offline

Joined: Jul 2012
Posts: 2,365
Nashville, TN via Memphis
It's gonna blow up.


16 WRX - PPPP
07 Tacoma V6 - M1 EP 5W-30, Fram Ultra, 10K OCIs, 208K
07 Yamaha R1 - Rotella T6 5W-40, Bosch 3300
07 Yamaha YZ-250, Klotz, Rotella

Re: Top off oil ? [Re: Camprunner] #4726792
04/14/18 02:11 PM
04/14/18 02:11 PM
Joined: Oct 2015
Posts: 2,930
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline

Joined: Oct 2015
Posts: 2,930
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, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.
1988 Ford Escort XR3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.


Re: Top off oil ? [Re: Camprunner] #4726795
04/14/18 02:15 PM
04/14/18 02:15 PM
Joined: Apr 2013
Posts: 2,557
The Northeast
mclasser Offline
mclasser  Offline

Joined: Apr 2013
Posts: 2,557
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
2013 Honda Pilot EX-L 4WD
2002 Honda Accord EX-L

Re: Top off oil ? [Re: Camprunner] #4726817
04/14/18 02:36 PM
04/14/18 02:36 PM
Joined: Mar 2008
Posts: 7,893
USA
slacktide_bitog Offline
slacktide_bitog  Offline

Joined: Mar 2008
Posts: 7,893
USA

Re: Top off oil ? [Re: Camprunner] #4726889
04/14/18 03:45 PM
04/14/18 03:45 PM
Joined: Jul 2013
Posts: 2,419
OBX & Central FL
NormanBuntz Offline
NormanBuntz  Offline

Joined: Jul 2013
Posts: 2,419
OBX & Central FL
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.


2017 Honda Odyssey SE, 18K
2013 Honda Accord LX, 59K
2007 Honda Ridgeline RTS, 89K
2007 Infiniti M35, 107K
Re: Top off oil ? [Re: Camprunner] #4726924
04/14/18 04:17 PM
04/14/18 04:17 PM
Joined: Oct 2014
Posts: 13,290
Canyon County Idaho
CT8 Offline
CT8  Offline

Joined: Oct 2014
Posts: 13,290
Canyon County Idaho
Oil is oil there all use the same additives. What chemistry is there to mess up.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Top off oil ? [Re: Camprunner] #4727008
04/14/18 06:36 PM
04/14/18 06:36 PM
Joined: Sep 2015
Posts: 6,172
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline

Joined: Sep 2015
Posts: 6,172
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.
Re: Top off oil ? [Re: Camprunner] #4727039
04/14/18 07:11 PM
04/14/18 07:11 PM
Joined: Oct 2004
Posts: 5,972
New Braunfels
Bryanccfshr Offline
Bryanccfshr  Offline

Joined: Oct 2004
Posts: 5,972
New Braunfels
I have some old sm Napa syn From a broken case I carry around for top up. Lasting forever..


2018 Trd Pro 4Runner
2018 Tacoma off-road

Dealer 0w20 to M1 0w40 FS -it depends
Re: Top off oil ? [Re: Camprunner] #4727044
04/14/18 07:16 PM
04/14/18 07:16 PM
Joined: Dec 2011
Posts: 5,650
North Carolina
rooflessVW Offline
rooflessVW  Offline

Joined: Dec 2011
Posts: 5,650
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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