"Tainting" new oil by just Drain & Fill ??

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SumpChump

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A friend of mine, a real "by the book" kinda guy. Disagrees with me that doing a mid OCI "drain and fill" is usefull/useless.

I like to do a drain and fill every 5k on my '13 Camry with 36k running TGMO and Toyota Filter element.

He claims that the .25 quarts in the filter taints the new oil significantly and causes it to be "old oil" within just 1k miles rather than the top performance of the oil if done at 10k as a full filter and complete oil change. In other word he says its ruining the new oil.

So, your thoughts on how mixing a bit of old oil with 4 quarts of brand new may ... age or taint the new.
 
You will never get all of the old oil out. Even with filter change, there will still be some old oil coating engine internals that you will never be able to remove, which will be 'tainting' the new oil, if we use your friend's logic. What does your 'friend' have to say about that and how it relates to oil changes in general?

With that said, personally I do like changing both oil and filter at the same time, but that's mostly habit. I could probably re-use the same filter for a second OCI.
 
Hogwash, especially when using the same oil, I've mixed oil on on the Camry dozens of times, have left even cheap oil filters on 10K (2 oci's), the thing still runs like a Lexus, in fact I have to look at the tachometer at stop lights sometimes to see that it's still running, that's how quiet it is.you friend paranoid at best.
 
Tainting would suggest you're adding a vat of acid and a can of metal shavings to 4 qts. of oil, you're adding oil to oil,
 
Originally Posted By: dishdude
If the oci is 10k, why dump the oil at 5k? Seems like a waste.


I follow a similar oil change scheme on my Passat with the 1.8 turbo. When you factor in a turbo, direct injection, a great many short trips, and VW's less than stellar record on engine oil problems it seems reasonable.
 
Originally Posted By: SumpChump
A friend of mine, a real "by the book" kinda guy. Disagrees with me that doing a mid OCI "drain and fill" is usefull/useless.

I like to do a drain and fill every 5k on my '13 Camry with 36k running TGMO and Toyota Filter element.

He claims that the .25 quarts in the filter taints the new oil significantly and causes it to be "old oil" within just 1k miles rather than the top performance of the oil if done at 10k as a full filter and complete oil change. In other word he says its ruining the new oil.

So, your thoughts on how mixing a bit of old oil with 4 quarts of brand new may ... age or taint the new.


Please don't subscribe to his reasoning. Just do a throughout oil change every time with "good" oil and filters.

Throughout meaning: drain until it is a slow drip; wipe out the filter cup; replace filter cup o-rings and lube them before install.

Just the normal stuff, and the engine will have plenty of life. If the oil is changed at the proper interval with a quality product then the slight remaining [old] oil isn't an issue.
 
Originally Posted By: dishdude
If the oci is 10k, why dump the oil at 5k? Seems like a waste.


He's trying to keep the engine varnish free.
 
How bout split the difference and do a 7500 mile / or 6mo oci with a NEW filter.
I this a load in cartridge?

Per Toyota NA
"TGMO" just means: ILSAC GF5 API/SN

They can sell you bulk CITGO in service and call it TGMO.

I have the TSB describing TGMO when TGMO became ILSAC GF4
 
.25 left behind means your car will blow up!!! You must let oil drain for 30 days to get it all out...or refill with cheap oil and drain it out after 5 min and refill
 
Last edited:
Originally Posted By: SumpChump
A friend of mine, a real "by the book" kinda guy. Disagrees with me that doing a mid OCI "drain and fill" is usefull/useless.

I like to do a drain and fill every 5k on my '13 Camry with 36k running TGMO and Toyota Filter element.

He claims that the .25 quarts in the filter taints the new oil significantly and causes it to be "old oil" within just 1k miles rather than the top performance of the oil if done at 10k as a full filter and complete oil change. In other word he says its ruining the new oil.

So, your thoughts on how mixing a bit of old oil with 4 quarts of brand new may ... age or taint the new.


Take a minute while you're shaving your chest hair and really think about the logic (or lack thereof) of what your "friend" said, especially when you've been active on this site for over a year and a half.
 
Who would do a fresh new complete OCI with filter change then top off with a half quart of the old drained oil? Nobody here would actually do that I'd bet, yet that is pretty much what you are doing when you leave a filter on.

But your friend is wrong, it has nowhere near the effect he is claiming. I have done it before and will do it again with no worries.
 
Originally Posted By: gathermewool
My oil is due to be changed in the Civic. I'll be leaving the Fram Ultra on for a third interval.


thumbsup2.gif
 
Hi,
SumpChump - There will always be some old lubricant left behind at an oil change. The amount depends on the engine family. It is of little consequence!

For example several years ago Mercedes Benz mandated a filter changed at every second oil change for their petrol engines. OCIs then were at 6k kms indicating that the filter was judged by them to be serviceable out to 12k kms

This applied to some of their most complex engine families

In your case it would be wise to just follow the OEMs recommendations
 
I do a quick and easy intermediate change after 11k myself, and a full change when the olm tells me to (22k so far).

so that's 4 litres of fresh oil after 11k.
 
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