cjb80

A local performance shop recommended 20w50 motor oil, I know that Royal Purple is good stuff, but I wanted to use 10w30... They said that 20w50 will be better because I am in South Florida (hot climate obviously.) Anyone have any comments??

Also, I am going to put Royal Purple in my tranny, anyone have any comments on that?

cdelena

Don't use 20W50 unless you want less power, use Honda stuff in the tranny, find another shop.

cjb80

What if I were to use 10w30 Royal Purple??

Has anyone used the Royal Purple in the tranny?? Why is that a bad idea?

txst

I'm with Chris. I have tried several different tranny fluids in the past and I have had the best feel/performance with the Honda MTF. Besides, with all of the trannyproblems that people have been having on this board (1-2 grinds, popping out of gears, etc), why take the chance on warranty/courtesy repairs by using a non-recommended fluid?

joe_s2k

[QUOTE]Originally posted by cjb80
[B]What if I were to use 10w30 Royal Purple??

Has anyone used the Royal Purple in the tranny??

StwoK

I have been using Red Line MT-90 in my transmission for the last 700 miles. It has never shifted better than it does now. I'm almost to the 7,000 mile mark. My S2000 is a early 2001 and I have experienced some 1st > 2nd problems. Red Line states their Synthetic MTLs contain NO reactive sulfur which will chemically wear synchros and cause a pre-mature failure. Red Line also claims to have the correct "coefficient of friction", it's not to slippery like motor oils. The "correct coefficient of friction" is perfect for rapid synchro engagement and allows for high-speed upshifting or down shifting. I have hit some of the sweetest speed shifts ever using MT-90 !!! Red Line makes 2 synthetic tranny fluids which could be used in our cars.

MTL = SAE 70W80 API GL4 gear oil with viscosities =10W30 motor oil.

MT90 = SAE 75W90 API GL4 gear oil with viscosities =10W40 motor oil. This is the one to use in the S2000's transmission.

I'm also using Red Lines 75W90 GL5+ Hypoid gear oil in the differential. This oil does contain sulfur(you can smell it), an additive for limited-slip differentials. It should not be used in manual transmisions due to its exterme slipperiness. Dino 90W Hypoid gear oil may take upto 5 minutes to warm up and start to lubricate. Most synthetics flow freely at 50 degrees below zero. Guess which one protects better? And you've been driving for 5 minutes.

Synthetics do preform better then dino, they can improve drivetrain efficiency by 5% , that's a reduction in friction which intern reduce running tempertures upto 70 degrees.

The bottom line here is that you are getting more power to the rear tires. This is one of the cheapest mods you can make that really does make a difference.

StwoK

cjb80 ........ About 20W-50 dino racing oil .....

A 10w-40 synthetic oil is the best choice for high-performance engines that see street as well as frequent track duty. 10W-40 synthetic will provide a thicker oil film at operating temperature than a petro-based 20W-50. The "oil film" is what protects engine parts from wearing. A dino 50W oil molecule is to large to find its way between close fitting bearings.

There was a thread last summer about Red Line synthetic. The person sent his oil(Red Line) out to be analyzed. He also had his factory fill oil analyzed by the same lab. Blackstone I think? The Red Line oil had the same additive that Honda puts in its factory fill for break-in.
Test were also done on Mobil 1 and Royal Purple, they did not measure upto the Red Line oil. Most Honda car racing teams use Mobil 1 and Mobil makes Honda's oils and lubricants for them.