Miata Mailing List: July 1997, Message #5
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From: 	"Alfie Rufino" <obsigame@globe.com.ph>

Subject: Mobil 1 for gear oil?!

Date: 	Tue, 1 Jul 1997 18:05:30 -0500



Hello everyone,



Reptile's due for a manual transmission and rear differential gear oil

change.  I understand that the proper lubricants to use are SAE 75w-90 and

SAE 90 respectively.  I gave Mobil Philippines a call to check on the

prices for the synthetic versions (for my piece of mind) of the said

lubricants and got a very unusual response.  They suggested that instead of

using the said lubricants, it would be better to just use Mobil 1 SAE

15w-50 synthetic engine oil for both the tranny and differential.  I use

the stuff for my engine due to increased loads from the SC, but for the

drivetrain?!  They mentioned that this would provide even slicker shifting.

 I am aware that some other car manufacturers (Honda Phils.) and mechanics

recommend the same thing.  Any thoughts on this?  Reptile usually goes out

in 95+ degree weather, won't the oil break down from the heat?  Another

thing, which is a higher standard, GL-4 or GL-5?



Thank you all!

Alfie Rufino

96 MX-5 1.6 BRG "Reptile"

Team Mazdaspeed