Is the 10w60 a recommendation from Lotus?
B&C confirmed to me 0W40 A3 B4, and that they use Mobil-1, 0W40 A3 B4 (fully synthetic). I bought a 20 litre drum of this from Opie Oils, @ just over £200, which should give me 3 oil changes.
For ref, it took exactly 6 litres to get it back to the top mark on the dipstick after sump and filter drain.
And a genuine oil filter (obviously Toyota, in a Lotus box) was under a tenner from B&C. I chose to change the oil & filter at 1300 miles, so just after run-in, as it can't hurt, and 10k miles seems a long shlep on oil used for break in.
I will be (as I do with most of my motors) doing intermediate oil/filter changes anyways, ie, every 5k in this case.
I ordered an oil drain/refil tool set from the states, that has an adaptor that screws into the oil filter body, and allows you to drain the filter via a flexi tube, before removing it, which saved a lot of mess.
-
https://www.ebay.co.uk/itm/114153335441
I wasn't able to use the blue part of the funnel, as it fouled the engine surround trim, but the screw-in transparent portion was useful to poke a regular funnel spout into, as the oil filler hole on the cam cover has a built-in strainer, right by the opening, making it very difficult to get the spout of the regular funnel to go in & rest there safely. This adaptor thing saved a lot of spillage, I'm sure.
Also bought the Synthetic gear oil (75/80, fully synthetic) for the manual transmission, but haven't changed it yet, because the oil level plug I was looking for, wasn't obvious. Turns out the tranny oil is a little more complex to change (lotus manual gives a drawing with dimensions, of how to make your own dipstick! You remove the oil return pipe from transmission cooler circuit, and dip the gearbox oil via that hole.
It also states, that you should use the Lotus diagnostic software to manually run the transmission cooler pump, to ejaculate the remaining oil out of that circuit, before refilling.