You're fine. There are a couple oil analyses posted over on bitog from S owners that had the same problem (dealer putting 5/20 in the S).

The oil analysis over the sample interval (3000 miles I think) was perfectly fine. Minimal wear, no shearing, etc. I'd get it changed, but in the meantime nothing is going to explode.

 

This is true, however, it is common knowledge that "Honda" dealers typically put 5W20 oil into virtually all Honda cars as routine. The fact that many Honda dealers see very few S2000s in their service bays makes this a pretty fair assumption that such a mistake is easy. Places like Jiffy Lube sees all kinds of vehicles. 5W20 is not the typical oil that goes into the vast majority of cars and trucks out there.

XLeezardx? Wanna tell us?

 

I wholeheartedly concur and would never (again) take my S to a Honda Dealer for service...my own horror story was that when my S was almost new I took it in for a 'free' oil change thrown at me by the dealer - the tech forgot to put the oil fill cap back on; instead leaving it on the plastic cowel just forward of the windshield...immediately upon start up I noticed a different sound from the engine and even a different feel, I couldn't quite figure what was up until I got home about 6 miles away...looked under the hood and found the cap along with quite a bit of oil spray above the filler hole....I enjoy doing my own oil changes before this experience and certainly since.

...in this case as I think you know I was merely pointing out that several of the posts were assuming that the car went to Honda and received the wrong oil...perhaps a case of contempt prior to investigation...and we all know what could happen when we ass-u-me??

 

Hi, i also got the similar problem, however i've got a 5w30 in my car is it ok ? what i was told is this will give a easier start and maybe save some fuel during the cold days? however when the car fully warms up the 5w30 is the same as a 10w30 ?? is this correct ? please help me!!

thx

 

You'll be fine. In theory, once the oil reaches operating temps, both should be a 30 weight but in reality, I think that the "winter" viscosity brings down the 30 a slight bit. This is purely my opinion based on observing oil pressures of both when up to temp. A 5W30 tends to hold just a tad lower pressure than a 10W30 at the same rpm.
I typically go to a 5W30 full synthetic for winter use. This flows even better in the cold than a non-syn of the same viscosity. However, I always go back to a 10W30 for hot summer operation.

 

The topic starter hasn't added any more info since the 1st post. Was the oil change done at a dealer, or someplace else?

Was the wrong weight oil used, or is the widow sticker just incorrect?

 

Heres the Story, After i got Eibach springs installed i took my car to a local mechanic i know that works on German and japanese vehicles to get my car aligned. They gave me a coupon for a free oil change in the mail a week before and so id thought id just get them to change it for me. couple days later, i noticed theres a reminder sticker on my windshield and it reads 5w-20 Castol synthetic. I immediatly pulled out my manual and nowhere does it say 5w-20. Only 10W-30 and 5w-40.

 

So, NOT a dealer.

 

I agree. To support xviper's opinion, I believe I read somewhere that the first # (10) is measured at 0 degrees C and the second # (30) is measured at 100 degrees C. Thus, even though a 5W30 and 10W30 will both be a 30 weight at 100 degrees, that doesn't mean they will be the same weight at 120 or 150 degrees. I believe the 10W30 will hold it's viscosity at higher temps better cuz' of the thicker base oil.

 

Thanks xviper, i got 2 more questions, ideally what might happen if we use the wrong filter, however it is still from Honda? 2. if I never race my car or rarely rev it up, do i have to use synthetic oil? can i just use normal mineral oil and just change it more often, maybe every 5000km ?

thx