Stock Oil Pressure gauge readings...

[IcelandGTO]

if it's a 0w40 or 10w40...it's probably fine. i think 40w is a little thick for a hot temp oil for your area, but it is a turbocharged engine with a notoriously hot engine bay--so it's your call.

cold temp, on the other hand, is not something to be taken lightly. i don't know what the precise temps are in your area, but if summer "warms up" somewhere between 10-15 celsius--i don't consider that warm enough to use a 20w or even a 15w cold. you will create premature wear on the engine; though to what extent i can't accurately judge.

okey i can go with it that over 10w is to high.
Im leaning towards MOBIL Super 3000 X1 5W-40

[IPD]

not as much of a fan of mobil1 as i used to be; but full synthetic is certainly good.

amsoil has 5w40 and 10w40 oils. shell rotella T6 5w40 oil is what i personally swear by. i would opt for either of those over mobil1--but again, unless you're demanding the absolute best & driving the piss out of it--you probably won't notice.

[IcelandGTO]

Thanks for the help Thadd

[IPD]

you're welcome!

[IcelandGTO]

A bit difficult to tell you it's safe since they're only notches. I can tell you mine used to hang out around there at warm-idle before I spun a bearing. After the rebuild it's above half at warm-idle.

Best to take the time to check it with a mechanical oil gauge, only have to do it once, but I would imagine it's just normal.

How?
where?
help?

[GTOJOE]

Mine always sits one line below the first major line. So 5 from the bottom.

[aaronatstate]

if it's a 0w40 or 10w40...it's probably fine. i think 40w is a little thick for a hot temp oil for your area, but it is a turbocharged engine with a notoriously hot engine bay--so it's your call.

cold temp, on the other hand, is not something to be taken lightly. i don't know what the precise temps are in your area, but if summer "warms up" somewhere between 10-15 celsius--i don't consider that warm enough to use a 20w or even a 15w cold. you will create premature wear on the engine; though to what extent i can't accurately judge.

I run Redline 10w40 all year round. I have had zero issues running it. Temp ranges from 15 degrees to 115 degrees ambient.

[DocWalt]

I always ran 10w30 all year, but I'd get some heat related pressure drop in the summer (90s) that was even noticeable on the stock gauge.

[IPD]

I run Redline 10w40 all year round. I have had zero issues running it. Temp ranges from 15 degrees to 115 degrees ambient.

10w40 is fine. if you hit over 90's a lot--you should run a 40 weight hot oil for those months at a minimum. the problem is running a 15w or 20w cold weight at temperatures at or below zero.

[Chris GTO TT]

10w40 or 5w40 are the only oils I'd run in a turbo car. 10w30 shears too fast and once is shears you are lacking protection in a motor that produces a lot of heat.