being that there was a change to SAE ratings, and 90w is now 110w, many of us are using le 1605 which is an sae 110w.

my question is, since there was an sae update, do newer s2000 owner's manual specify 110w for the diff oil, or does it still say 90w?

and if it still says 90w, wouldn't it be incorrect for people to go out and purchase 90w gear oil?

also for mobil 1 users, when do people switch from mobil 1 75w90 to a 75w110 (how would anyone know when mobil 1 updates their labeling to reflect that it is 110w...because if they already did, buying 75w90 would be potentially harmful)?

 

http://www.lubrizol.com/products/automotiv...ar-oil/J306.asp

My 2007 manual still shows 90w. Since the 90w specified is the old standard, you can use either 90w or 110w today. But there's general agreement that at above zero climates, your S will be happier with 110w.

 

^
great link...my question is basically this...

Your Labels May Need To Change
The revised SAE J306 may cause some labeling issues in the marketplace. Lubricants should be labeled according to the guidelines of the revised standards. The problem is that lubricants blended to the high end of the old ranges may be on the market labeled as SAE 90 or SAE 140, when they are really SAE 110 or SAE 190 lubricants. Lubricant manufacturers should examine their records and adjust their labels to reflect the viscosity ranges described in the updated J306 standard.

 

^
another question, shouldn't honda specifiy a 110w?

what if honda is aware of the new 110w specifications and still recommend a 90w? i doubt this, but how would we know?

 

Honda is saying viscosities of 13.5 to 24 are okay in your car. So you can use either today's 90w or 110w. No issue. You decide. Neither should void any warranties. I'm sure some amount of engineering work would be required to come up with a new specs. They're just not going to spend the money. So, buy some LE 1605 and be happy.

 

Amsoil 75W140

 

thereur Posted on Nov 20 2008, 10:25 PM
Yes, but its only half - or 3/4 of - the story.
They specify SAE 90, a single grade, not a multigrade.
All the data I've found on gear oil showed that multiweight gear oils in the popular 75W-90 gear oil range are on the thin side.
Single grade gear oils are more on the thicker side.