Switching from 0w-20 to 0w-30 experience

[jtwrace]

Not sure, but the mechanics are on the max 5k miles OCI.

Interesting. No TSB then? They're just coming in with wiped cams after 5k OCI?

 

[altaylar]

If that were true, EPA would have never allowed, and almost no manufacturers would have taken the CAFE hit if they could pick up 10% by sticking with smaller diameter rims.

My vehicle comes with 18s or 20s depending on trim level, and considering that the Touring trim with 20s weighs several hundred pounds more in luxury upgrades over the base model with 18s and suffers less than a 3% mileage hit, I’d love to see some industry data backing your 10% claim as I’d switch tomorrow if that were true.

10% is definitely an exaggeration, but they do make some difference. By switching to a smaller rim you are essentially replacing some of alloy wall with rubber wall, if that makes sense. That to a degree reduces unsprung mass, and makes a bit of difference on the track. On a street application I could imagine maybe a percent of fuel economy advantage? I am just making it up, i havent seen any numerical data on that so just speculating.
I'm really in facor of smaller wheels though. Not because of fuel economy, but because of potthole resistence. I know some people hate seeing wide walls, but honestly I really don't care at all

 

[Danno]

Interesting. No TSB then? They're just coming in with wiped cams after 5k OCI?

No, the mechanics opinion is to go with 5k OCI. Not sure where you're going with TSB comment.

 

[jtwrace]

No, the mechanics opinion is to go with 5k OCI. Not sure where you're going with TSB comment.

Got it! Yet, I'm sure most customers are going 10k OCI. TSB comment was if the manufacturer has acknowledged an issue.

 

[oil pan 4]

Got it! Yet, I'm sure most customers are going 10k OCI. TSB comment was if the manufacturer has acknowledged an issue.

OEMs love this.

 

[rondhol]

Camshaft wear is often just caused by poor metallurgy in some engines. No matter what we do with it 5k OCI usually helps on preventing caked up piston rings from degraded base oil or additives package, but rarely help on Camshaft, timing guide, or timing chain wear. Some engines just have poor quality parts. Probably using 0w40 helps, just like the bandaid on GM engines