Lubricants

 

LUBRICANT RECOMMENDATIONS

Models

Engine

Transmission

Rear Drive

Aprilia 1000cc, 750cc, & 1200cc V-twins, 2010 V4s

15W-50 SJ

---

---

Aprilia Mana 850s, Pegaso 650, 2011-on V4s

5W-40 SJ

---

---

Aprilia RS50, RS125, RS250

2-Cycle

75W-90 GL5

---

1967-1998 Guzzi 700cc-1000cc

20W-50 SG

80W-90 GL5

80W-90 GL5*

Guzzi V50s, V65s

20W-50 SG

80W-90 GL5

85W-140 GL5*

Breva/Nevada 750, V7s

10W-60 SG

85W-90 GL5

85W-140 GL5

V7 IIs, V7 IIIs, V9s

10W-60 SG

75W-90 GL5

85W-140 GL5

Breva 1100, 1200 Sport, Norges, Stelvios, Grisos

10W-60 SG

85W-90 GL5

80W-90 GL4

1100 Guzzis: solid lifters (all but ’03-’04 Cals)

10W-60 SG

80W-90 GL5

80W-90 GL5*

Californias with hydraulic lifters (2003-2004)

5W-40 SG

80W-90 GL5

80W-90 GL5*

1400s

10W-60 SG

85W-90 GL5

80W-90 GL4

* Also requires Moly additive


GUZZI GEAR LUBES AND MOLY ADDITIVE

Why so many different viscocities?

We don’t know. But here’s what we see as significant: at the very same time, Guzzi recommends 4 different viscosities. So this isn’t merely a changing attitude over time. And we say, why not follow their specifications? It really doesn’t cost you any more. Sure, you might have to buy two bottles now, but you’ll probably then have enough for two changes.

What’s different between GL4 and GL5?

Each is made to lubricate different materials. So while you will see some lubes labeled as GL4/GL5, they are truly GL5 and we feel shouldn’t be trusted in applications that specifically call for GL4. Internet resources

Using the correct additive where required

Moto Guzzi’s recommendation for the transmission allows you to use just about any good quality GL5 gear lube of the correct viscosity right out of the bottle. Not so with rear drives until recently. Until the mid-2000s Guzzi recommend the use of a molybdenum (moly) additive. There are not a lot of additives of this type to be found. We have found an appropriate additive, made close to here in Bremerton, WA (so we really didn’t have to look very far), called Power Punch EL-1.

The V700, V7 Special, and Ambassador are not specified by Moto Guzzi to use a moly additive. We think it’s safe to assume the reason is simply that this update was made after these models had started production. Since nearly all subsequent models until recently call for it, we’re sure these early bikes would benefit from the additive as well. Some other early big-twin parts books don’t mention the additive in the model specifications listings while their service manuals do. Recent models of the “Piaggio Era” such as the V7s, V9s, 1400s, and CARC models do not specify the additive. We checked and not only got confirmation that they don’t use it, but also that moly was still recommended for earlier models, so this was not a change of heart but a change of engineering. And those rear drives designed for use with the moly additive should still be given that treatment.

Additive quantity

The following table lists the appropriate quantities of both gear lubricant and moly additive for each model. Quantities for the V700 and Ambassador are our estimates.

Models

Drain Type

Gear Lube

Moly

Total

Small twins except fuel-injected 750s

10-mm plug

160cc

10cc

170cc

Breva 750, Nevada 750, V7s, V7 IIs, V7 IIIs

10-mm plug

170cc

---

170cc

V9s

10-mm plug

210cc

---

210cc

V700, V7 Special, Ambassador, early (rare) V7 Sport

10-mm plug

170cc

10cc

180cc

Eldorado 850, 850 GT, 750 S, 850-T, & most V7 Sport - plus V700, V7 Special, & Ambassador with updated rear-drive case

6-bolt sump

340cc

20cc

360cc

Tonti-frame big twins with a rear disc brake; Daytonas, Centauros, Sport 1100, Sport 1100i

10-mm plug

230cc

20cc

250cc

V11 Sport, V11 LeMans, Ballabio

10-mm plug

350cc

20cc

370cc

Breva 1100, 1200 Sport, Norges, Grisos, Stelvios

10-mm plug

380cc

---

380cc

1400s

10-mm plug

250cc

---

250cc

Possible rear-drive lube quantity update for four-speed models

The original versions of the rear-drive case for each of these models had a 10mm drain plug (17mm wrench size) and carried 180cc of lube as specified in the various factory publications. Starting in about the mid ’70s, the replacement gear case and complete rear-drive assembly were updated to the case used on the Eldorado 850, V7 Sport, and 850-T. This later case has a small sump held in place by six 6mm Allen screws (5mm Allen wrench size) and must be filled with 360cc of the appropriate gear lube and additive.

Possible rear-drive lube quantity update for the Eldorado 850

The parts book lists the early, incorrect rear lube quantity of 230cc rather than 360cc of the appropriate gear lube and additive.

A caution on the use of the early Eldorado 850 level plug

If you’re in a rush and you use the level plug to tell when the rear drive is full while adding gear lube you may be under-filling the rear drive. That’s because the lube tends to cascade over the ring gear and some will run out the level hole before that level has actually been reached.

And note that on early Eldorado 850 rear drives, the level plug was placed way too low. Using this level hole will insure the early demise of your rear drive.