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That is correct. A 0W-40 is typically not going to resist shear well, as Lake said in his recent video. It will be able to stay at or above a 20 grade for a good amount of time though, which is likely one of the reasons it's chosen for racing applications using the K20C. Depending on the OCI, it...

I'm sure Grok knows the intricacies of Toyota engines better than a Toyota master mechanic. Checks out 👌 /s

Depends entirely on climate, driving habits, oil formulation, etc. Starting your car up in 20F and letting it idle for 10 minutes will drastically increase your fuel dilution since the A/F will be rich and the ring seal will be poor. Generally the K20C from what I've seen doesn't have...

Get a good 0W-20 like PUP or similar, and you're good. 3-5k miles or every 6 months, whichever comes first, if you're not going to do UOA.

"Kept it's viscosity" and it's 6.5 which is in the 16 grade range according to SAE grades. I have no idea why Blackstone chooses their own viscosity range seemingly. Mine was 6.3cst on my factory fill, which is also garbage. I would recommend switching to a different oil that can at least stay...

This just an additive package thing but, Blackstone has the virgin calcium (ZDDP and others too tbh) at 1161 and your UOA from a different lab has the calcium at 1549? That is an insane difference lol. Were you running a different oil prior to this OC?

Asking an AI chatbot isn't "data" it is a potentially biased accumulation of information with unknown sources that can also be generated to an extent. Depending on the prompt you give an LLM (and which one you're using), that can change the perspective of the response. Aside from that, I doubt...

Plenty of forum posts about Honda race team oil choices, and Honda recently stated, "Formula R will be offered in 6 viscosity grades including 0W-40, the same formulation used in the championship-winning IMSA Civic Type R TCR race car." ....and we're still just running in circles on this thread...

"Formula R will be distributed through Honda and Acura dealerships beginning spring 2026 and are recommended for performance models like the Civic Type R and Integra Type S. The full synthetic lineup will include six different viscosity grades to meet a wide range of driving needs. " That's...

A stock K20C running 0W-20 could easily do 5km oil changes (we've seen plenty of folks on here do long OCIs with low wear metals), but I would shorten the interval if you have a track day in there, especially at high temperatures due to oil oxidation. @johnloov is changing his a bit more...

Yeah I was gonna mention that I've done 3 UOAs before 10k (might end up being 4), but I knew from Lakes videos that it was somewhat pointless because there would be elevated wear until I got past that point. I just wanted to see the trend for my own car, but @AspecR at 28k miles you should be...

Yup that is line with what Lake Speed has said regarding oil oxidation. You should be changing your oil in very short intervals with track days anyway so I don't think oxidation is the limitation with good synthetic oils. 5W-30 will oxidized faster if it's at a higher temperature but it will...

0W-30 to 20W-50 is like an 8.2cst jump in viscosity (insanely high) using the average of each range. 10W-40 to 15W-50 is abou a 4.7cst jump. 0W-20 to 5W-30 is about 2.8cst. So both of those are quite a bit higher than the 0W-20 to 5W-30 jump I've been talking about. Even street driven, my PUP...

Yeah I meant testing on track since that's what we're talking about. I saw the dyno testing video 2 years ago but I can see potential issues with the testing methodology in that video regarding test order and heat soak which could contribute to temperature differences. In some ways it would be...

Agreed, I have not seen anyone test this properly or quantify the actual difference in the FL5/DE5. I understand it may be common knowledge that higher viscosity oils run hotter, which there is already a heat transfer difference between oils regardless of viscosity (race oils shown by Lake Speed...

The K20C calls for 0W-20 at street driving temperatures. 0W-20 oil at track temperatures is a lower viscosity than what the engine was designed for. I'm going to keep saying this until the end of time lol. You continue to neglect this when recommending what is "safe".

Yep, Honda does not make their own oil. I'm not aware of any big car manufacturers that make their own oil since they can just have someone supply a base oil and additive package to their specifications. Toyota certainly doesn't make their own oil but their spec of mobil1 is different from...

I could not care less how cold oil flows out of a container in relation to its performance in an engine. Cold flow is important but we have used oil analysis to tell us how the oil is performing on cold starts in our own cars, which is the use case and environment that matters. Are we gonna...

I'm using the Bonoss titanium drain plug on my car and it seems to do the trick. I don't have an opinion on which ones are good or not, I just like their spacers and thought it was cool they offered a magnetic drain plug so I wanted to try it.

I'm using a magnetic drain plug because anything you can see left on the plug are particles too big to see in oil analysis (this is according to Lake Speed Jr.). It gives you two methods to determine what's going on in your engine and get ahead of a wear/catastrophic problem. I also have...