I have my 90,000 km service due on my 2013 MY14 Lancer.
I purchased Castrol Edge 5w-40 fully synthetic from Supercheap over the weekend, as it was half price. $34.95 vs $69.88 like it is back to today. I did look at the 5w-30 which is what Castrol recommend for the car however it is only SL rated, whereas the 5w-40 is the newer SN rated. I would much prefer using a SN class oil
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Two things also required at this service to meet log book requirements is spark plugs and CVT fluid. For the CVT, it has to be J4 fluid, so currently that pretty much means Mitsubishi genuine fluid, so is more expensive. I believe Castrol and Gulf Western now make a J4 compliant CVT fluid, but they're harder to get. Penrite is currently only J1.
The other thing required is spark plugs. The recommended spark plug for the car is the NGK DIFR6C11, which no joke, is probably the most expensive plug out there! It's also not the easiest to get either. Even though they state 90,000 km for the spark plugs, NGK claim a longevity of 80,000 to 100,000 miles:
https://www.ngk.com/product.aspx?zpid=29216It's almost as if Mitsubishi have stated to change the plugs at 90,000 km instead of miles. In any case, as you can see they're US$20 each, probably much more in Australia.
Is the Denso IK20TT a suitable alternative? It appears to be the equivalent of the DIFR6C11 operationally, but it isn't stated as such. It appears the VFK20F is the direct replacement, but like the DIFR6C11 favours longevity. Hardly seems worthwhile using damn expensive plugs which are just damn expensive for the luxury of being a little longer lasting, when they still list the cars as needing new plugs at 90,000 km anyway. This is especially true since cheaper, just as good alternatives cost less and still have a life expectancy greater than the service interval.