Thoughts on partial oil change?

[demarpaint]

Not worth the effort. I have a few empty quart bottles around and would just drop the quart from the 5 quart jug into one of them. Eventually it will get used.

 

[kschachn]

A few previous threads on this particular topic that may be helpful. There are a few more:

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Thread 'Partial oil change?'

Aug 29, 2009

Having looked over the info regarding old oil being able to protect better than fresh oil (a severely debatable point, I realize)...

I just wonder, assuming that the old oil argument is correct... I wonder if you could get the best of both worlds by doing a partial oil change?

In a 5 quart engine, you could pump two or three quarts out through the dipstick tube, and replace them.

Then change the oil filter at the next interval, and maybe pump out and replace 2 quarts...

I thought of this because in my 1993 Ford Escort's earlier years, it was burning about a quart of oil every 1000...

• fuel tanker man
• Replies: 20
• Forum: Passenger Car Motor Oil (PCMO) - Gasoline Vehicles

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Thread 'Down side of partial oil changes?'

Mar 31, 2023

I don't like getting under my car and I don't drive as much as I used to so I have simply siphoned a quart out of the sump and added enough to bring it up to full mark for the last year or so. Engine uses a quart per 4,000 miles. Filter is an oversized Fram Ultra so I'm not worried about that. Question is, if this were to continue indefinitely, is there a downside to not ever totally draining the oil?

• WobblyElvis
• Replies: 67
• Forum: Passenger Car Motor Oil (PCMO) - Gasoline Vehicles

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Thread '? on partial oil change'

Nov 27, 2009

2005 dodge diesel, dello 400 with wix filter. Say I went 5,000 and then drained 1 gallon and added a gallon every 2500 miles after, how long would you go before a filter change and a complete oil change.

• Gator
• Replies: 13
• Forum: Heavy Duty Engine Oil (HDEO) - Diesel Vehicles

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Thread 'Half an Oil Change?'

Feb 25, 2016

I just did UOA and got my report. I would post it, but BITOG doesn't accommodate posting pdf files, and I'm too lazy to manually enter all the data. Getting to the point, my particle count is 14/13/11 compared to my baseline sample of new oil having 17/16/13; so my oil is about 8 times as clean as new oil, all of my wear metals look excellent and my TBN is well within limits...

However, I don't think my air filter is as good as my oil filtration; I've got 30 ppm silicon. (Blackstone and other labs start caution at about 20 ppm Si.). Since I've run the oil only 8K, I've used (and drawn out...

• Ihatetochangeoil
• Replies: 33
• Forum: Engine Oil Bypass Filters

 

[53' Stude]

Just use the quart up on the next oci, then you'll have two left over, then three and then enough for a complete oci.

Exactly! Must be real slow here on BITOG lately with these type of threads

 

[OilStained]

it cant make things worse

You've summed it up well already.

Glad I searched and didn’t start a new post.

 

[RyanY]

I assume you have a naturally aspirated engine; if this is not the case (i.e., you have a turbo) everything below may be irrelevant.

Buy individual quarts instead of a jug during a parts store sale/rebate offer; they don't care if you take a 5 qt jug or individual qts. Then you only have a single qt bottle on the shelf.

Also, for the oil-only change in the middle, don't change anything at 2k. Use a premium filter and do an oil-only change at 4k. Change the filter every 8k. Unless, of course, you have a confirmed dirty engine that could benefit from frequent OCs (like my Cadillac 3.6).

 

[DCDG]

I have a fumoto drain valve on my car that + my set of ramps I can already do a full oil change + filter in less than 15 min. My car takes exactly 4 quarts. I buy 5 quarts because they are much cheaper. But hate having them take up space in my hot and humid garage.

I know there is really no added benefit to doing this, but it cant make things worse right? I do 4k change intervals and was thinking drain a quart and 2k mark and add the quart i have left over

I extract the oil every 2500-3000 miles on the wife’s Rogue and change the filter between 5&6k. I could see you doing similar. That’s just me being proactive on maintenance for the vct engine.

 

[4wd]

Think the OP left the building long ago …

 

[DCDG]

Think the OP left the building long ago …

What are you saying a few quarts short an oil change lol jk

 

[Astro_Guy]

I extract the oil every 2500-3000 miles on the wife’s Rogue and change the filter between 5&6k. I could see you doing similar. That’s just me being proactive on maintenance for the vct engine.

Why? 7500 miles was the commonly recommended OCI 25 years ago.

 

[DCDG]

Oh not the vct engine it’s as delicate as a music box

 

[Allaned]

I have a fumoto drain valve on my car that + my set of ramps I can already do a full oil change + filter in less than 15 min. My car takes exactly 4 quarts. I buy 5 quarts because they are much cheaper. But hate having them take up space in my hot and humid garage.

I know there is really no added benefit to doing this, but it cant make things worse right? I do 4k change intervals and was thinking drain a quart and 2k mark and add the quart i have left over

I store odds and ends of oil outside in a box in my yard. (I do have a big lot).

 

[OilStained]

Think the OP left the building long ago …

This topic was relevant to me.

 

[Japanese]

I know there is really no added benefit to doing this, but it cant make things worse right? I do 4k change intervals and was thinking drain a quart and 2k mark and add the quart i have left over

Just keep the extra oil in your basement or closet. That's all.