🔴💊 Engine Oil Red Pill Thread: Only Post If You Have UOA - Official Honda Civic Type R K20C1 Engine Oil Analysis

[absolude]

Posting for additional data. 1st oil change at 4,200 miles on my bone stock 2025 FL5. Switched over to 5W-30 Formula R and added a PRL HVI w/ AWE Dryflow filter. Plan to do another fluid change/analysis around 8,000 miles or so.

Thanks for posting this.
How would you describe your driving style?

 

[johnloov]

Posting for additional data. 1st oil change at 4,200 miles on my bone stock 2025 FL5. Switched over to 5W-30 Formula R and added a PRL HVI w/ AWE Dryflow filter. Plan to do another fluid change/analysis around 8,000 miles or so.

Your Aluminum will slowly come down, as this is engine break in. It will take you the first 10,000 miles to fully flush out your engine.

 

[pellper]

Thanks for posting this.
How would you describe your driving style?

Spiritedly, but this is my daily driver on a short freeway commute. Kept it under ~3,500 rpm for the first 600 miles. No current plans to track/canyon runs.

 

[johnloov]

Okay here is what the data looks like - on the same track - same exact 2nd lap - same location where engine temps spike braking before turn - heater on, A/C Off, recirculate on, fan off.

0W-20 Pennzoil Ultra Platinum vs 5W-30 Castrol Edge Extended Performance.

Pennzoil Ultra Platinum 0w20 is about 8.8 CST at 100C ( close to upper limit of OW-20 is 9 CST ) and Castrol Edge Extended Performance is rated at 9.9 CST at 100C ( very thin 5W/30 optimized for fuel efficiency formula )

This data is not conclusive, but it seems like there is close to no difference based on this data in increased heat in engine operating temperatures at least on lap 2. I unfortunately lost my log R data history from the past, and was trying to find after 6 laps what is the difference.

It looks like the 1 CST increase is safe, but going to a 5w-40 or thicker 5w/30 - has been reported to increase engine temps on a stock car. At some point I'll be trying that as well.

Pennzoil Ultra Platinum 0w20 API SQ:

5W-30 Castrol Edge Extended Performance API SQ:

5W-30 Castrol Edge Extended Performance API SQ - lap 5 - more heat soaked - 228F

 

[eap35]

not to hijack the post, what's the statistically/scientifically best oil now to use for FL5 Type R that is ''short tripped'' think <7 miles from cold start to office 4-5 days a week. Currently living in Boston,MA. Will love starting to track maybe ~7-8 times a year as well as maybe have some autocross once a month?

 

[xpystchrisx]

The best oil for that is changing your oil early. Any quality oil will need to be changed somewhere on the order of 1000 to 3000 miles depending on how much fuel dilution happens during those short trips. This could probably be extended by taking the car for a long drive once a week in order to get the oil fully up to temperature.

 

[AspecR]

not to hijack the post, what's the statistically/scientifically best oil now to use for FL5 Type R that is ''short tripped'' think <7 miles from cold start to office 4-5 days a week. Currently living in Boston,MA. Will love starting to track maybe ~7-8 times a year as well as maybe have some autocross once a month?

Pick a 0W-20 oil in your favorite color bottle that meets both API-SQ and ILSAC-GF7A certification. Change it when your maintenance minder gets between 50-60%.

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