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post #21 of 31 (permalink) Old 01-28-2017, 07:15 PM
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Originally Posted by rav4magician View Post
I have a 2015 Rav4 - I changed oil & filter at (around) 10,000km; but every 1000-1500km, I added 500ml of engine oil (Castrol Sync 0w20) - so that driving is always very smooth....

I am not sure it is the right or correct way...
So it used a pint every thousand miles? Hard to believe unless brand new.

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post #22 of 31 (permalink) Old 01-28-2017, 08:21 PM
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Originally Posted by rav4magician View Post
I have a 2015 Rav4 - I changed oil & filter at (around) 10,000km; but every 1000-1500km, I added 500ml of engine oil (Castrol Sync 0w20) - so that driving is always very smooth....
I am not sure it is the right or correct way...
Are you replacing oil it used or just adding it for good measure in case a full moon sneaks up on you?

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post #23 of 31 (permalink) Old 01-29-2017, 10:31 AM
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Or just follow Toyota's recommendations and find something else to worry about.
Absolutely agree.......
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post #24 of 31 (permalink) Old 01-29-2017, 06:08 PM
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A growing stack of used oil analyses shows that 10,000 mi oil changes on the proper synthetic oil work just fine.

Times change, technology improves. Soon we'll be just as comfortable switching from 5K or 7.5K oil changes as we were switching from 3K to 5K oil changes.

Last edited by Bob K; 01-31-2017 at 09:13 PM.
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post #25 of 31 (permalink) Old 01-30-2017, 03:22 AM
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Talking to someone who has worked at Toyota for 40 years. He said that within the next 40 years, we will drive cars with combustion engines where we won't have to replace the oil at all any more.

The synthetic oil will be made to last the life of the vehicle through a combination of better engine technology and better oil technology. That would be amazing, huh?

I kind of figured we'd all be driving electric cars anyway in 40 years so it will become a moot point!

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post #26 of 31 (permalink) Old 01-30-2017, 08:04 AM
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A growing stack of used oil analyses show that 10,000 mi oil changes on the proper synthetic oil work just fine.

Times change, technology improves. Soon we'll be just as comfortable switching from 5K or 7.5K oil changes as we were switching from 3K to 5K oil changes.
IMO at 10K with synthetic the life of the filter becomes the determining factor.

The 3K interval was never "real" being just a way for the quick lube shops to make more $$$. Now they have so many upsells to snare customers they may not need to push 3K.
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post #27 of 31 (permalink) Old 01-30-2017, 01:05 PM
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I remember in 1980 when I bought my first new car. It was a 1981 Honda Civic, and the maintenance schedule said to change the oil every 7500 miles. I thought that was crazy! 7500 miles? Everyone was changing oil at 3000 miles back then. But I followed the schedule, rode that car hard for 160,000 miles and it never did burn oil. And no synthetic either.

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post #28 of 31 (permalink) Old 01-31-2017, 09:12 PM
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IMO at 10K with synthetic the life of the filter becomes the determining factor.
That's a good point and a good question...does the oil hold up as well as the filter? In my case, yes. I used a Toyota OEM filter during my 4 UOAs. The analyses indicated the filter worked quite well through 10K miles.
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post #29 of 31 (permalink) Old 02-04-2017, 10:02 AM
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oil change interval

I believe in Canada the regular interval is 5,000 miles and the requirements for severe service are 5000 miles in the owners manual. Thats good enough for me to use that as my change interval. I do my own changes as I bought a half dozen filters at the local dealer after they ran a 20% off sale. The extra cost is minimal to me other than time. Why would Toyota use a 5000 mile interval in Canada and not in Minnesota or other states with similar cold climates? I also put in a magnetic oil drain plug.

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post #30 of 31 (permalink) Old 02-04-2017, 01:19 PM
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Originally Posted by JuneBug View Post
I remember in 1980 when I bought my first new car. It was a 1981 Honda Civic, and the maintenance schedule said to change the oil every 7500 miles. I thought that was crazy! 7500 miles? Everyone was changing oil at 3000 miles back then. But I followed the schedule, rode that car hard for 160,000 miles and it never did burn oil. And no synthetic either.
I totally agree with you. Back in 04 I worked in a R&D facility that developed interior materials for Honda, Toyota and GM. I had the opportunity to speak with a senior engineer of Honda North America. I asked him what he thought about the debate on changing the oil . He laughed and said "We spend hundreds of millions of dollars developing and testing our engines .We have the best testing facilities , What would be the benefit to us of telling you to change your oil at 7500miles (5000 severe conditions) instead on 3000 if it was going to damage our engines? The customer pays for the oil change not us. If anything our recommendation are based on the safe side.

Now ask the same question of the oil change places and local shops and mechanics and guess what, they make more money every time you change you oil. Where is the proof that changing the oil sooner prolongs the engine ? In the last 15 years between 10 and 16 million cars are sold in the US and if changing your oil at recommended intervals was damaging the engines shouldn't there be proof by now?

If someone wants to change their oil early that's up to them. I trust that Toyota did the testing needed to assure me its safe to change at recommended intervals. My only recommendation would be to check oil levels monthly.
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