Any transmission oil/engine performance relationship?

sagaboy · Post by **sagaboy** » Sat Apr 16, 2005 9:33 am

I was using 140 wt transmission oil but changed it to 75/90 synthetic yesterday, went for a spin and noticed that….

1. Engine idle speed went up from 850 to 1,050 (200 rpm more)

2. My usual morning start-up with my disarmed carb auto-choke required an initial slight press of the gas for 15 seconds before the engine can rough idle without cutting-out—but with the new 75/90 tranny oil—7 seconds is sufficient and hardly any noticeable rough engine idling thereafter.

3. A vast improvement with acceleration--from experience—the improvement got to be at least 6% --a threshold before anyone can perceive/feel any improvement.

4. I told my next door mechanic about it and he said; “75/90? Hey, that’s pretty low for a transmission” … I replied, that’s what multi-grade are all about isn’t it? They are supposed to work that way 75 when cold and 90 during operating temperature—he (mechanic) kept quite.

Is everything a figment of imagination or real?—Need some confirmations, thanks.

rcb78 · Post by **rcb78** » Sat Apr 16, 2005 3:41 pm

Good God, what the hell is wrong with you. Did you not read any of the replies in your post about tranny oil weight? Everyone, EVERYONE told you that the 140wt was too heavy and to use a good 75w-90. Do you maybe think now you can start listening and stop trying to rebut any and all help that is given to you? --Ryan

Guest · Post by **Guest** » Sat Apr 16, 2005 4:25 pm

Keep running that post count up SAGABOY. You'll hit the record sooner or later.

sagaboy · Post by **sagaboy** » Sun Apr 17, 2005 8:57 am

Ryan... that was a different case--my previous half-dead tranny was making so much noise--hence the 140wt oil--hoping to cure it.

Finally I got it replaced with a rebuilt and that under tree repair guy insist on using 140wt oil--but I was thinking it (tranny oil) got to be changed after a certain run-in mileage anyway--see I did listen to you guys and changed it right, relax... everyone's tutoring have not gone to waste

)

All I can say is that shifting gears with 140wt tranny oil is shi#%!*# compared with 75/90 synthetic--not mentioning other benefits-- Hence the question… Any relationship between transmission oil and engine performance?

Post by **Marc** » Sun Apr 17, 2005 9:40 am

sagaboy wrote:...Any relationship between transmission oil and engine performance?

Obviously there is, as you've witnessed first-hand.
What's the problem, you've been dreaming up imaginary symptoms and correlations for so long that you can't recognize a real one when it hits you in the face?

rcb78 · Post by **rcb78** » Sun Apr 17, 2005 10:17 am

It doesn't matter what the case was, you were told by everyone that there was no need for such a heavy oil regardless, unless you had serious other issues that needed attention first. --Ryan

rcb78 · Post by **rcb78** » Sun Apr 17, 2005 12:23 pm

Why don't you go and re-read your own post. I only see one post that said to use 140wt if you wanted to, but only because the tranny was junk and it didn't matter anyways. How could you interpret this one post to hold true for a newly rebuilt tranny and take precedence over everyone else's advice? --Ryan

http://www.shoptalkforums.com/viewtopic ... t=gear+oil

I personally like this part

sagaboy wrote:100% confirmed that 140 wt transmission oil is correct for warm/hot countries with daily temperature above 28C.

500LbGorilla · Post by **500LbGorilla** » Sun Apr 17, 2005 1:05 pm

Sagaboy, use the red stuff.. it's faster.