alvav
Senior Member
- First Name
- Leonidas
- Joined
- Jan 21, 2019
- Threads
- 8
- Messages
- 221
- Reaction score
- 138
- Location
- Naxos, Greece
- Vehicle(s)
- 2018 Civic Type R, 2019 Acura NSX
Yes, the foreign manual allows 5w30, we are not in disagreement about that at this point.
Operating temperature of oil in an engine with a properly maintained cooling system is in the 100-120C range regardless of whether it's 20C or 40C outside. There is no need to run a heavier hot viscosity oil just because it's warm outside. It does not confer any protection advantage in normal use, and in fact probably will cause more wear, especially if you run something drastic like 20w50 or 10w60.
The belief that you should run heavier weight oil in the summer is a false one left over from the days of straight weight conventional oils. Because you could only pick a single viscosity in those days, people would run 5-10 weight oils in the winter which did not protect very well at operating temperature, but the oil pump would seize and bearings would be wholly unprotected if 30-40 weight was used in cold temps. Once temperatures began to rise, the 5-10 weight oil was swapped out for a 30-40 weight which gave better hot protection (and the oil pump could actually move it because the engine was warmer at start-up).
Like I said previously, if you are tracking the car, I can see running a higher weight oil since you may see higher temps and more viscosity could help protect the engine, but in normal use, temperature simply does not matter with modern multiweight oils.
Yes, the foreign manual allows 5w30, we are not in disagreement about that at this point.
Operating temperature of oil in an engine with a properly maintained cooling system is in the 100-120C range regardless of whether it's 20C or 40C outside. There is no need to run a heavier hot viscosity oil just because it's warm outside. It does not confer any protection advantage in normal use, and in fact probably will cause more wear, especially if you run something drastic like 20w50 or 10w60.
The belief that you should run heavier weight oil in the summer is a false one left over from the days of straight weight conventional oils. Because you could only pick a single viscosity in those days, people would run 5-10 weight oils in the winter which did not protect very well at operating temperature, but the oil pump would seize and bearings would be wholly unprotected if 30-40 weight was used in cold temps. Once temperatures began to rise, the 5-10 weight oil was swapped out for a 30-40 weight which gave better hot protection (and the oil pump could actually move it because the engine was warmer at start-up).
Like I said previously, if you are tracking the car, I can see running a higher weight oil since you may see higher temps and more viscosity could help protect the engine, but in normal use, temperature simply does not matter with modern multiweight oils.
Hehe. Pretty typical of my posts? Really? What posts, in particular, are you referring to? (There haven’t been that many). The recent ones about the Gross profit on a CTR? I believe that I have mentioned that I owned a Honda dealership until a few months ago (for over 15 years) so, yes, again I was starting fact, not opinion. I referred you to the Bible on oil (bobtheoilguy); Engineers giving their opinion not...you (or me for that matter). It is very well known that manufacturers, particularly in North America, specify the 0W20 for fuel economy purposes. On top of that, dealers put the same shit 0W20 oil that they use on base Fits and Civics in the CTR. THe Honda type 2 0W20 is over $15 a liter. If you don’t think that the oil helps the cooling system in maintaining a safe operating temperature, we’ll then, I don’t have much more to say to you. Oh, and you must know better than the Honda engineers that recommend the 3 viscosités that I mentioned- with the caviat that only the Type 2 Honda oil should be used should you choose to go with 0W20.
Sponsored