M21 Oil Weight/Brand Recommendation

[mockingbird812]

Tried our search... no joy. Sorry, as I am sure this has been discussed. This is for a 70 442.

Thanks!

[TDW]

Sam, I did some research on this a while back. What I found and use in all my Muncies is Pennzoil Gearplus SAE 80W-90W GL4. The GL4 works best with the brass syncros.

[Salvatore]

good choice Tony.

[mockingbird812]

Thanks guys!

[VintageMusclecar]

I'm using CRC GL-4 as directed by the man who built the Muncie in my Chevelle.

Link

[smoke' em II]

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[mockingbird812]

I like pixtures!!!!!!!!!! [img]<<GRAEMLIN_URL>>/grin.gif[/img]

[novadude]

Sta-lube stuff above is what is in mine. Works fine. I think I got it through Amazon.com, but I know NAPA stores carry it as well. My local store didn't have the qt size, so I just mail ordered.

[Hemicolt]

Royal Purple:

Synchromax – Manual Transmission Fluid

Synchromax is a manual transmission fluid that increases performance and the life of your equipment. It improves shifting, reduces gear noise and increases power transfer to the wheels. It also lowers operating temperatures and provides outstanding wear protection for longer transmission life.

Synchromax is recommended for manual transmissions that specify an automatic transmission fluid. It’s also ideal for 4×4 transfer cases and motorcycle gear boxes. Synchromax is fully compatible with all types of friction materials. It provides excellent corrosion and oxidation protection without affecting the soft metals commonly found in manual transmission synchronizers.

Synchromax is formulated with Royal Purple’s proprietary Synerlec technology for unsurpassed performance and protection.


Max Gear – High Performance Gear Oil

Max Gear is recommended for use in truck and automotive front or rear differentials, manual transmissions and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid. It is non-corrosive to soft yellow metals (brass, bronze, copper, etc.) and synchronizer safe

Max Gear is an ultra-tough, high performance automotive gear oil designed to provide maximum protection to heavily loaded gears while maximizing power throughout the drive train. Max Gear outperforms ordinary gear oils by combining the highest quality synthetic oils with Royal Purple’s proprietary Synerlec additive technology. Max Gear makes gears run smoother, quieter, cooler and longer without overhauls. Max Gear is formulated with a friction modifier additive – no additional additives are necessary.

Max Gear is available in the following viscosities: 75W-90, 75W-140, 80W-90, 85W-140 and SAE 90

[Salvatore]

Sam, if you do not drive them you can run water if you want. Only need gear lube if the car is not a lawn ornament.