Friends,
I am having 2 two bullets Std 350 (C.I. 3 box engine) & Machismo A350 (AVL 3 box engine).
Till now I use car engine oil in my bullets, for C.I. 20w 50 & for AVL 20w 40 with latest API rating available.
During googleing for JASO MA certified oils for bullet (old 3 box only), I came to know the API rating consideration is very important while choosing and oil for bike/ car.
Due to pollution norms API has reduced drastically the ZINC & PHOSPHORUS contain in API SJ and above rated oils & this is harmful for old flat tappet engine. There are many articles on internet for this matter but all are limited for 0w 30 to 10w 30 SAE grades. Mostly modern petrol engines are having recommended lube of SAE 10w 30 grade & for diesels it is 15w 40.
Now as the older bullets are having flat tappet concept at two places (top and bottom of tapped rods), my problems (actually confusions) are as follows:
1. What about the SAE 20w40/50 grade with API SJ or higher ratings for ZINC & PHOSPHORUS (anti wear compounds)? Is there no limitation from API in these grades for ZINC & PHOSPHORUS? Or I should search API SF/SG (as specified in Owner’s manual) grade oil for such SAE viscosity?
2. Should I go with JASO MA/MA2 certified oil with API SL ratings to compensate anti wear compound? But in this case there is loss of friction modifiers benefit for enhanced life of piston barrel.
&
As traditional anti-wear compound are limited by API in SJ and above ratings, what JASO certified oils are adding as anti-wear compound?
What are the merits & de-merits of using a JASO certified (with API SF or higher) oil in old bullets?