oil pressure differences - xxw40 vs xxw50

[MrJingles705]

Another oil thread I know but with a slight twist to the usual.

recently had my 996.2 C4 serviced - usually use Northway but they were fully booked up, I was over interval and tyres were knackered so ended up using OPC Reading.... wallet thoroughly destroyed so won't be doing that again! - anyway, they used Mobil P-Life 10w50 oil as opposed to the Mobil 1 0-40 weight used by Northway/RPM etc.

Now, on the previous oil I noticed that the oil pressure would max out at 4.5 around the 4/4.5K rev mark and not climb after that under normal warm running (assuming the pressure release bypass is kicking in at this point?) ..... if it got super hot I may not see 4.5 of pressure until 5k, but generally pretty stable.

However with the new 10w50 oil I'm finding max oil pressure is topping out at 4.5 by 3k revs, even if I am giving it serious beans/in traffic post a fast run. Idle pressure is around 2 on the 10w50 vs 1.5 on the previous oil, so the low end pressure is not an issue.

So question:

1) Is the Mobil P Life 10w50 too viscous at operating temp for UK generally, or UK at this time of year? have the OPC messed up here? (this for regular mobil1 stuff, understand the nano's have specific properties that change the equation a but here)
2) is having max oil pressure coming in at 3k 'bad' (in terms of higher rev's basically triggering the pressure bypass and flowing less oil as a result of in being more viscous)

I admit I could be overthinking this

[Green1man]

The result you are seeing is exactly what you would expect. Hartech (and others) seem to recommend slightly thicker oil for older cars, I guess to allow for piston seal wear, so yes I think you are overthinking and all is good.

[Budflicker]

Agreed, i run my 996 C4S on Millers 10w50 nanotech.