986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Trans oil - hope I ordered correctly

wmjosiah · 02-24-2018, 04:20 AM

I'm just looking up spec sheets on the web - I don't have any special sources. The spec sheet for that oil you just mentioned says:

Viscosity at 104F: 76.0
Viscosity at 212F: 15.4
Viscosity index: 211

Thanks for mentioning this - that actually looks even closer to Porsche Spec than the Lubri-Moly GL-5... but it's GL-4, not GL-5, which many people on the web claim is a good thing in these transmissions because apparently GL-5 can wear copper bits, and our transmissions have those?

Have you used the Motorcraft Synthetic 75w-90?

I'm sure there are other specs that are also important and I know very little about oil.

02-24-2018, 04:20 AM	#17
wmjosiah Registered User Join Date: Feb 2018 Location: Belchertown, MA Posts: 36	I'm just looking up spec sheets on the web - I don't have any special sources. The spec sheet for that oil you just mentioned says: Viscosity at 104F: 76.0 Viscosity at 212F: 15.4 Viscosity index: 211 Thanks for mentioning this - that actually looks even closer to Porsche Spec than the Lubri-Moly GL-5... but it's GL-4, not GL-5, which many people on the web claim is a good thing in these transmissions because apparently GL-5 can wear copper bits, and our transmissions have those? Have you used the Motorcraft Synthetic 75w-90? I'm sure there are other specs that are also important and I know very little about oil. __________________ '01 Boxster S '08 Mazdaspeed 3 '04 SV650 '96 K2500 Diesel 5-speed with DB2/4900 conversion Last edited by wmjosiah; 02-24-2018 at 04:27 AM.