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the thing that worries me is if the oil is going to get too thin if i stay at high rpms for too long, i'm building my jimny as if it was an old style rally car and want to be able to keep the revs high without worrying too much
I would expect that if your oil is getting too hot then your water temperature would also go up. The only reason I mentioned water is that as far as I know the Jimny doesn't have an oil temperature sensor, so water temperature is the only thing we can easily measure.
You could follow JackonlyJack's advice and try 10W40 or best of both worlds, 5W40, but that might be a bit more expensive.
2020 blue SZ5 (one of the last to be registered in the UK)
Ex 2011 Blue Jimny SZ4
Northumberland Jimny Blog
yeah the m13a doesn't have an oil temp sensor, but i'm having an aftermarket one installed and an indicator, maybe i'll just use 10w40 to see if it's better, otherwise i might try 10w50? hoping it's not too thick
also my water temp is always in the middle even after pushing a lot, even though the engine bay is pretty warm in that case and i tend to stop and let the engine idle with the hood opened to help it with the temps, you know, just in case
the water temps have never given me any issues even in the summer (we get to 37C here in italy), but i'm worried that the oil might thin out too much, and that running an oil that's too thick might not let it get thin enough to lubricate well if i don't drive hard
The first number in the specification of the oil is the weight of the oil when cold, the second is the weight when hot, both the 10w30 & 10w40 oils will be the same weight cold, but the 10w40 will be thicker when hot.
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