You can google for the exact serial number for the plugs, try denso or bosch... both are good...
The oil was recommended to you because its a safe grade, meaning it will not harm your engine but it is ok nevertheless... this grade (20w 50 is recommended for old engines... the oil recommended for your car would be 5w 30 but you can use 5w 40 fully synthetic too)...
I don't like f 10 caltex for fuel... Never had an oil change there... i prefer going to f 6 caltex... but if you get liqui moly, you'll have to do the oil change yourself or ask some mechanicto do it for you...
And don' t go for semi-synthetic, it's rubbish... either fully synthetic or plain mineral... anything in between is just a cheap ripoff...
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