The turbo A series on the dyno currently has mineral 20w50 mineral oil in it(penrite hpr30).

Ziggy is coming to play tomorrow, I'll buy some 0w40 full synthetic and do a back to back test and we'll post results. Probably Mobil 1, not sure where to by Motul in Ballarat.

Mineral oil-based 5W-30 will also increase your HP -- at least in lower temperatures (short trips). On long highway trips where the oil get up to full temp you wont see as big an improvement over regular 10W-30 oil

Datsun approves of 5W-30 for a-series engine (see Engine Oil Specifications). Can the synthetic can be run even during summer?

Synthetic also lasts longer, while mineral oil breaks down after 5000 miles or so

Back in the L Series days of the yellow 1200, I went from a mineral oil to semi synthetic and picked up 7 rwhp. Change in viscosity also but much of the increase came from moving away from mineral oil. Any reputable brand should yield a good result - but I have to admit to being a Motul fanatic 👍
Cheers.

The Royal Purple race oils and Mobil 1, 0-40 will show an increase in HP too. Lowering the oil level in the sump by having a deep pan sump also makes power. Those oils are lighter than I would be prepared to run in something with a lot of valve spring.

I have been speaking to a fellow 1200 racer today who tells me that this Motul oil is the very est and his tuner guaranteed him another 3-4hp just by using this over normal mineral oil.
Certainly the reviews that I have read on the net are all good but I have heard these sorts of claims before, not to mention the cost ( which if it is as good as they claim I guess justifiable )
Has anyone had any experience with this oil?
Cheers
Dave