I have a 1997 Toyota Landcruiser with 166k miles on it. My normal oil is Rotella T6 5W-40. It holds 8 quarts and typically doesn't consume or leak much oil between changes. I have 3 quarts of Castrol 20W-50 GTX that I would like to use up by mixing with 5 qts of T6 at the next oil change. Any issues foreseen with this combo? Vehicle travels about 10k per year, is supercharged and has a fresh valve job on it. Typical use is daily driving and one or two trips to Moab for rock crawling per year.
Mixing Oils in a 1997 Landcruiser
- Thread starter tom in boise
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Use one oil.
Change the oil in your OPE with the Castrol or give it to someone that will use it. It's $6 worth of oil.
Besides, your Land Cruiser takes two jugs of T6 for each change. You'll spend more for a jug + 1qt of T6 to make your "blend," and then post asking us what to do with your leftover 3qts of T6.
Change the oil in your OPE with the Castrol or give it to someone that will use it. It's $6 worth of oil.
Besides, your Land Cruiser takes two jugs of T6 for each change. You'll spend more for a jug + 1qt of T6 to make your "blend," and then post asking us what to do with your leftover 3qts of T6.
You make a good point.
Why worry about using a few quarts of oil by mixing it in something that isn't a beater?
Maybe use it for top-offs in the Cruiser if it needs any or use it in a lawnmower or beater.
Other uses for this old GTX than a treasured old Toy.
Why worry about using a few quarts of oil by mixing it in something that isn't a beater?
Maybe use it for top-offs in the Cruiser if it needs any or use it in a lawnmower or beater.
Other uses for this old GTX than a treasured old Toy.
Just like topping up on a trip. You use what's at hand. Full crankcase is better than low oil. Just use it up, blend away, and don't worry
Or you could buy a 5qt jug of GTX and do an OCI with GTX 20W-50.
Mixing oils isn't optimal, and I don't know why it has become an accepted practice here. "It won't blow up" doesn't mean it's a good practice.
Mixing oils isn't optimal, and I don't know why it has become an accepted practice here. "It won't blow up" doesn't mean it's a good practice.
Originally Posted By: Dallas69
It's become an accepted practice because it won't hurt anything.
Mix away my friend.
Ahh, the old "nothing will blow up" so therefore it's good logic.
Have a look at the back of the bottle, and see all the industry specs that either oil has passed in it's design, testing, and manufacture.
Consider taking whiteout, and removing every single one of those specs and approvals...would you buy that bottle if it was sitting on the shelf ?
Lets say the brand name was "She'll be right", and the list of approvals was "nothing is likely to blow up"...would the average BITOGer use it ?
It's become an accepted practice because it won't hurt anything.
Mix away my friend.
Ahh, the old "nothing will blow up" so therefore it's good logic.
Have a look at the back of the bottle, and see all the industry specs that either oil has passed in it's design, testing, and manufacture.
Consider taking whiteout, and removing every single one of those specs and approvals...would you buy that bottle if it was sitting on the shelf ?
Lets say the brand name was "She'll be right", and the list of approvals was "nothing is likely to blow up"...would the average BITOGer use it ?
Paging CATERHAM, aisle 3...
That's a great year 80. My old girl is a 1996 with about the same number of miles and not supercharged. I had run mobil 5w30 for years and recently switched to 0W 40 Castrol after consultation with the Bob is the oil guy crew. It has run great with both.
Originally Posted By: Dallas69
I have never seen any damage from mixing oils.
Has anyone here?
No matter what blend you comes up with it is still oil.
Not molasses,goop,cement or anything to have nightmares over.
Exactly - has ANYONE ever submitted evidence of two oils mixing into some kind of problem ... No.
I have never seen any damage from mixing oils.
Has anyone here?
No matter what blend you comes up with it is still oil.
Not molasses,goop,cement or anything to have nightmares over.
Exactly - has ANYONE ever submitted evidence of two oils mixing into some kind of problem ... No.
Originally Posted By: Dallas69
I have never seen any damage from mixing oils.
Has anyone here?
Every time you offer the challenge, I've given you the SAE paper where exactly that happened...do you keep forgetting about it ?
Why ?
Is it intentional ?
Yes, it's rare that it results in catastrophic failure, but it HAS happened.
More likely is that some other parameter, most likely cold temperature performance, will suffer, which if you REALLY need your 0W, very possibly might not be there when you need it.
AND it's entirely avoidable at very very little cost, isn't it ?
I have never seen any damage from mixing oils.
Has anyone here?
Every time you offer the challenge, I've given you the SAE paper where exactly that happened...do you keep forgetting about it ?
Why ?
Is it intentional ?
Yes, it's rare that it results in catastrophic failure, but it HAS happened.
More likely is that some other parameter, most likely cold temperature performance, will suffer, which if you REALLY need your 0W, very possibly might not be there when you need it.
AND it's entirely avoidable at very very little cost, isn't it ?
Originally Posted By: Dallas69
I have never seen any damage from mixing oils.
Has anyone here?
Yes, people on this board who are in the industry have definitely seen problems. They're not common, they tend to happen at the limits, but the damage has been seen and documented, and papers published.
I have never seen any damage from mixing oils.
Has anyone here?
Yes, people on this board who are in the industry have definitely seen problems. They're not common, they tend to happen at the limits, but the damage has been seen and documented, and papers published.
Originally Posted By: BrocLuno
Exactly - has ANYONE ever submitted evidence of two oils mixing into some kind of problem ... No.
http://papers.sae.org/932831/
Oil in a tractor was changed from 15W40 to 5W30, and engine subsequently failed...the mix was found to perform worse than the 15W at cold temperatures, even 'though the 5W30 was 80% of the mix.
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4257160/Re:_New_Mobil_1_Racing_0W30_VO#Post4257160
May or may not have blown chinks, depending on how careful the poster was with mixing.
Exactly - has ANYONE ever submitted evidence of two oils mixing into some kind of problem ... No.
http://papers.sae.org/932831/
Oil in a tractor was changed from 15W40 to 5W30, and engine subsequently failed...the mix was found to perform worse than the 15W at cold temperatures, even 'though the 5W30 was 80% of the mix.
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4257160/Re:_New_Mobil_1_Racing_0W30_VO#Post4257160
May or may not have blown chinks, depending on how careful the poster was with mixing.
Come on now.
You find rare obscure cases where problems may have happened anyway. In sub zero temps a lot of things can go wrong.
And a tractor?
Tractors in most cases are not taken care of very well.
If you don't run the correct wt you can have issues .
Let me rephrase my post to say any approved oils of the same wt can be mixed and be OK in 99% of the time.
There.
It doesn't turn into something other than oil.
You find rare obscure cases where problems may have happened anyway. In sub zero temps a lot of things can go wrong.
And a tractor?
Tractors in most cases are not taken care of very well.
If you don't run the correct wt you can have issues .
Let me rephrase my post to say any approved oils of the same wt can be mixed and be OK in 99% of the time.
There.
It doesn't turn into something other than oil.
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