I believe Lotus recommends from their testing 5W40 with the 2zz .So Toyota recommends 5w30. Lotus I believe is 5w20. On a MWR invoice I seen 10w30. So which one is best for a DD (not driven in winter)?
Thanks in advance.
I don't think it's so much that there is less contaminants from changing the oil as much as fresh oil changes can wear down the engine more then extended oil changes. Once the oil gets into a groove after about 3k miles then it should create less wear for the rest of the oil change interval.NOPE
extended changes have advantages of time, money and most importantly you are introducing less contaminants into the car as you are not opening it up for 4-6 changes a year.
WE WILL JUST HAVE TO DISAGREE a little bitNOPE
depends on the oil. Many here (1zz &2zz) Casrtol european formula, made in germany, 0W30 (GC). It is now called Edge SPT and it is an A3 rated oil - the highest standard for a DD.
Using blackstone labs and some oil pulls in my 1zz 4 qts of this stuff at 10,000 miles is just starting to loose its additive mix due to breakdown. This result was had 3 times so I am on an 8-10k/1 year interval.
Oils are different you need to test them to determine what each oil can do. at $9/qt GC is pricey but it is worth it to me it goes in my Mini too (which the computer holds as a 15K interval)
extended changes have advantages of time, money and most importantly you are introducing less contaminants into the car as you are not opening it up for 4-6 changes a year.
do not discount quickly what the manual says because I feel this information was in fact researched but that recommend oil, which may work well may not be optimal. Totoyta dealers use castrol GTX -a fine oil with the right interval but GC is better your engine will run quieter and with a regular change of your PCV valve at 30-50K intervals you will get no sludge.
You have to be willing to try something new trust people here BUT validate results with testing to know for sure if you are doing better or worse than OEM choice.
I wonder how generic oil performs such as autozone oil but I'm too scared to try..Just more than one way to skin a cat. Good oil/filter often or better oil less often, do good maintenance. You may also consider adding some breakin oil with zinc to your oil changes.
Please keep an oil analysis of this oil I'm confused as to why GC is better than usa made Castrol.I have a turbo 2zz and with Edge Titanium I change it ever 5K miles.
Two points here I would like to address, Toyota recommends 5W-30 oil for a good reason and none of them is for performance. These engines were meant to be daily driven and not subjected to severe use and to top it all off, Toyota is concerned with meeting CAFE standards for economy not for the performance of your engine. If you drive your car well within the oil temp limits then 5W-30 will serve you well. Lotus on the other hand has tested the 2ZZ in more extreme conditions and have found that a 5W-40 is the recommended oil and they don't care about energy conserving. A comfortable medium is the GC because it sits at a thick 30wt oil.I would stick to 5w-30 since Toyota designed the engine around this weight oil, 30 being the important part. I use 0w since I drive to work in the early frigid mornings and like to have the oil rings lubricated as quickly as possible since cold starting the engine is when most damage is done.
There should be no confusion, GC is better then your Redline. Redline is a good oil however it has not proven to be better then GC on oil analysis. So why should that matter, well it's very simple and that's because you are wasting your money when GC is just as expensive as most of the synthetic oil off the shelf. Bottom line is it's good value and great oil and that is why most car enthusiast forums like this one have been recommended the piss out of it for many years.I'm confused as to why GC is better than usa made Castrol.
I'm also a show me person and a lot of what you say is old tech as the oil industry is ever evolving.I am much more of a show me person rather than a bleeding edge new.