Gear Oil change time
#17
Addicted Specialist
Rennlist Member
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Originally Posted by Rob 97 993c2
how often do u have to replace the transmission oil? when do u know that it is bad?
I tracked my car about 5-7 weekends/year on my daily driven 993 with annual miles of about 12K, and so I figured under such duress I'd change the tranny oil (Mobil1 75w/90) every year. Everytime I drained it, it was still kinda dark honey colored, at least some indication that it ain't "grimed up." Now that I've retired my 993 to pure commuter duty, I think I'll go every other year (prob about 20K miles total for that 2 years) before I replace the oil. I think that is prudent given it's use. That is still *much* more frequent than the factory recommends, but perhaps an expert will chime in.
Edward
#19
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Join Date: May 2007
Location: Kirkland, WA
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Thanks,
Doug
#20
Race Car
Thanks guys. I have read the p-car.com DIY for this and the author stated that he was not entirely happy with the Mobil One. As much as I wan to support my Motul friend, I would like to hear from anyone who has used it. WOrst case scenario, I'll pick up some Mobile One.
What about the Redline or Amsoil? Any thoughts?
What about the Redline or Amsoil? Any thoughts?
#22
Drifting
When you guys say Mobil 1 are you talking Delvac?
I ran Amsoil 75W90 for a year and then the Redline. I can't say there was a noticeable performance difference. I think 2nd was a little notchier when cold with the Redline but that is about it.
I ran Amsoil 75W90 for a year and then the Redline. I can't say there was a noticeable performance difference. I think 2nd was a little notchier when cold with the Redline but that is about it.
#23
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Hmmm, talk about an old thread!
I just recently went to Redline. Not intentional, really. I have always used M1 since it's easy to get and cheap. But since my car was at my buddy's shop a short while ago, and I was due for a change, I figured why not as it was already on his lift ...and what he uses is Redline. I felt no difference whatsoever, FWIW.
Edward
I just recently went to Redline. Not intentional, really. I have always used M1 since it's easy to get and cheap. But since my car was at my buddy's shop a short while ago, and I was due for a change, I figured why not as it was already on his lift ...and what he uses is Redline. I felt no difference whatsoever, FWIW.
Edward
#24
Race Car
Mobil 1 Delvac is what is recommended by transmission guru Brian Copans and my shop, RUF Dallas. That is what I use on my recently upgraded/repaired transmission. Works well.
#25
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Help the Second Gear grinding when cold
I put in both Mobil One (not Delvac) and Motul around 30K miles and did not see any significant difference. Both were not quite as good as the Delvac factory fill, which we didn't know about then. I plan on trying the Delvac version again soon as I am approaching 60K miles.
One trick to reduce the second gear grinding when the car is first run: leave it in second gear when parked. You still have to shift a bit slowly at first, but it really does make a difference.
Last edited by Pete Lech; 10-22-2009 at 06:24 PM.
#28
Found some interesting items on the Mobil One Site:
https://www.mobiloil.com/USA-English...ollection.aspx
https://www.mobiloil.com/USA-English...ollection.aspx
#29
Race Car
Try to google it for a seller.
#30
Rennlist Member
Mobil DELVAC 75W90...replaced SHC690...Available in 1 gal. tubs from Grainger Supply and www.Lufteknic.com. How often??? Different folks will give different answers. Time/mileage dependent.