Tony's right, as long as the oil is up to the correct spec, use it. Frequent and regular oil changes with the right oil is far more important than the "should I use synthetic or not" debate!
We had a similar thread on the 1100S forum a day or so ago - maybe worth pasting my twopenneth in here..................
The spec for the boxer engine oil is as follows:
"Brand name HD oil, API classification SF, SG, or SH; combination with CD or CE suffixes are permissable. Alternatively brand name HD oil CCMC classification G4 or G5; suffix PD2 is permissable"
I'm not very well up on oil technology but.....
......The SF to SG signifies the development stage of the oil, actually all the API classifications up to SH are now obsolete - we're now onto SJ and the latest is SL. CD and CE are actually Diesel oil classifications! This can only be used if the CD/CE is combined with the S# classification.
The CCMC classification is the old Europen Standard which has now been replaced by the new ACEA system. The G4 or G5 Spec is therefore from the CCMC classification - not to be confused with the GL classification which is the API Classification for gear oil! - confused?
So - the 2 classifications mainly in use these days are API (American Petroleum Institute) and ACEA (Association des Constructeurs Européene d'Automobile)
The equivelent (or to exceed the equivelent) of CCMC G4 or G5 you'll need the ACEA A2 or A3
All the info regarding the oils specs should be printed on the container, if it's not, put it back on the shelf where you took it from! Generally speaking you're always best sticking to good branded stuff like Castrol, Shell etc.
In short, what you're looking for is API SJ or SL. ACEA A2 (or A3) on the container if it's got that and the viscosity of SAE 10W-40 or 15W-40 it's ok to put in your Boxer. There's also the Japansese JASO (Japanese Standards Organisation) classifications ......erm, we'll do that another day eh?
Any total bollox stated here will no doubt be pounced upon by someone of smarter arse than I - watch this space
some useful info:
http://www.castroljapan.com/eng/useful_aboutoil_grades02.shtml
Dave
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