620 oil.

Hi all, my wifes Monster 620 is needing engine oil. Any reccomendations as what to use, i think it has only had Shell oil before, but i dont know whether it was fully synthetic or semi. TA.

[slob]

It's full synth. Many people recommend a semi-synth with a wet clutch.
I switched to Rock Oil Synthesis4 on my 620 after problems with clutch slip. Had no probs since, even though that's full-synth too.

Semi 10/40 in my 748 and Louise's M750 for the past 3 years with no problems at all. I use fully 10/40 in my 620 DD for racing but if it was on the road it would have semi in it.

Cheers for the replies, decided to go for Shell advance 10/40 semi synth.

[jerry]

No need for full synththetic in an aircooled Ducati in fact the latest thinking is to use 20-50w in the aircooled bikes.....But 4v watercooled models must have full synthetic......also Shell advance is not actually a fully sythetic oil its a class 4 oil which is a mineral/synthetic con .Full synthetics like Putoline,Motul 3000 or Mobil1are class 5.

[chris.p]

Originally Posted by dunlop0_1

Semi 10/40 in my 748 I use fully 10/40 in my 620 DD for racing but if it was on the road it would have semi in it.

I would recomend a move up from 10/40 on the 748, as the oil is to thin for a road bike, i.e. it does not leave a thick enough coat of oil on the rockers,

see here, for full tech

http://www.sigmaperformance.com/rockers.html



And here for the short version.

The second choice is the oil you use. Ducati recommend Shell Advance Ultra, we recommend Rock Oil Racing Synthesis4, others talk about Motul 2000 and there are adherents to AGIP 4t Super Racing. All of these are thickish 15/50 or 20/50 racing spec fully synthetic oils. All have very high shear strengths (Cst's of 16 and above) and take time getting around the engine when it is first started, but they all leave a thick film of oil on everything so that weeks later when the engine is next started, there will be some oil already there. We take apart engines that have not been run for weeks and, when they have been run on a good oil, we find a thick film of oil clinging to the rockers. It is not any where as good as a generous fresh supply but it is a lot better than a thin film that falls away from the mating surfaces as soon as the engine is stopped. Mineral or thin 5w40 or 10w40 oils have their place, but not in a Ducati engine. (For a little more on this see Supermono tech).



As for your DD bike, being a 620 & wet clutch your best bet is a Semi synthetic, less problems with your clutch.


Chris.